Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

ajax_example_dynamic_sections_validate in modules/examples/ajax_example/ajax_example_graceful_degradation.inc
Validation function for ajax_example_dynamic_sections().
ajax_example_node_by_author_autocomplete_validate in modules/examples/ajax_example/ajax_example_autocomplete.inc
Validate handler to convert our title string into a nid.
ajax_example_unique_autocomplete_validate in modules/examples/ajax_example/ajax_example_autocomplete.inc
Node title validation handler.
authorize_filetransfer_form_validate in core/includes/authorize.inc
Form validation handler for authorize_filetransfer_form().
block_add_block_form_validate in core/modules/block/block.admin.inc
Form validation handler for block_add_block_form().
block_admin_configure_validate in core/modules/block/block.admin.inc
Form validation handler for block_admin_configure().
block_custom_block_translate_validate in core/modules/block/block.admin.inc
Form validation handler for block_custom_block_translate().
book_admin_edit_validate in core/modules/book/book.admin.inc
Form validation handler for book_admin_edit().
book_admin_settings_validate in core/modules/book/book.admin.inc
Form validation handler for book_admin_settings().
ckeditor5_settings_form_validate in core/modules/ckeditor5/ckeditor5.admin.inc
Additional validate handler for filter_admin_format_form().
ckeditor_settings_form_validate in core/modules/ckeditor/ckeditor.admin.inc
Additional validate handler for filter_admin_format_form().
color_scheme_form_validate in core/modules/color/color.module
Form validation handler for color_scheme_form().
comment_admin_overview_validate in core/modules/comment/comment.admin.inc
Form validation handler for comment_admin_overview().
comment_config_create_validate in core/modules/comment/comment.module
Implements hook_config_create_validate()
comment_form_validate in core/modules/comment/comment.module
Form validation handler for comment_form().
config_config_data_validate in core/modules/config/config.module
Implements hook_config_data_validate().
config_import_single_form_validate in core/modules/config/config.admin.inc
Validate handler for config_import_single_form().
config_test_hooks_config_create_validate in core/modules/config/tests/config_test_hooks/config_test_hooks.module
Implements hook_config_create_validate().
config_test_hooks_config_delete_validate in core/modules/config/tests/config_test_hooks/config_test_hooks.module
Implements hook_config_delete_validate().
config_test_hooks_config_update_validate in core/modules/config/tests/config_test_hooks/config_test_hooks.module
Implements hook_config_update_validate().
contact_category_edit_form_validate in core/modules/contact/contact.admin.inc
Form validation handler for contact_category_edit_form().
contact_site_form_validate in core/modules/contact/contact.pages.inc
Form validation handler for contact_site_form().
date_combo_validate in core/modules/date/date.elements.inc
Validate and update a combo element.
date_field_instance_settings_form_validate in core/modules/date/date.admin.inc
Form validation handler for _date_field_instance_settings_form().
date_field_settings_validate in core/modules/date/date.admin.inc
Form validation handler for _date_field_settings_form().
date_field_validate in core/modules/date/date.field.inc
Implements hook_field_validate().
date_field_widget_settings_form_validate in core/modules/date/date.admin.inc
Form validation handler for _date_field_widget_settings_form().
date_html5_element_validate in core/modules/date/date.elements.inc
Element validation callback for the HTML5 widget.
date_popup_validate in core/modules/date/date.elements.inc
Massage the input values back into a single date.
date_select_validate in core/modules/date/date.elements.inc
Validation function for date selector.
date_text_validate in core/modules/date/date.elements.inc
Validation for text input.
date_timezone_validate in core/modules/date/date.elements.inc
Validation for timezone input.
date_validate in core/includes/form.inc
Validates the date type to prevent invalid dates (e.g., February 30, 2006).
date_views_argument_handler::options_validate in core/modules/date/views/date_views_argument_handler.inc
Validate the options form.
date_views_argument_handler_simple::options_validate in core/modules/date/views/date_views_argument_handler_simple.inc
Validate the options form.
date_views_filter_handler::extra_options_validate in core/modules/date/views/date_views_filter_handler.inc
Validate the options form.
date_views_filter_handler_simple::date_select_validate in core/modules/date/views/date_views_filter_handler_simple.inc
Validation hook for exposed filters that use the select widget.
date_views_filter_handler_simple::extra_options_validate in core/modules/date/views/date_views_filter_handler_simple.inc
Validate the options form.
date_views_filter_handler_simple::value_validate in core/modules/date/views/date_views_filter_handler_simple.inc
Value validation.
date_year_range_validate in core/modules/date/date.elements.inc
Element validation function for the date_year_range form element.
dblog_filter_form_validate in core/modules/dblog/dblog.admin.inc
Form validation handler for dblog_filter_form().
email_example_form_validate in modules/examples/email_example/email_example.module
Form validation logic for the contact form.
email_field_validate in core/modules/email/email.module
Implements hook_field_validate().
entityreference_field_validate in core/modules/entityreference/entityreference.module
Implements hook_field_validate().
entityreference_view_settings_validate in core/modules/entityreference/views/entityreference.views.inc
Element validation callback for EntityReferenceSelectionHandlerViews.
entity_example_basic_form_validate in modules/examples/entity_example/entity_example.module
Validation handler for entity_example_basic_add_form form.
entity_form_field_validate in core/modules/entity/entity.module
Attaches field API validation to entity forms.
field_attach_form_validate in core/modules/field/field.attach.inc
Perform field validation against form-submitted field values.
field_attach_validate in core/modules/field/field.attach.inc
Perform field validation against the field data in an entity.
field_config_create_validate in core/modules/field/field.module
Implements hook_config_create_validate().
field_config_delete_validate in core/modules/field/field.module
Implements hook_config_delete_validate().
field_config_update_validate in core/modules/field/field.module
Implements hook_config_update_validate().
field_default_validate in core/modules/field/field.default.inc
Generic field validation handler.
field_example_3text_validate in modules/examples/field_example/field_example.module
Validate the individual fields and then convert to RGB string.
field_example_field_validate in modules/examples/field_example/field_example.module
Implements hook_field_validate().
field_test_entity_form_validate in core/modules/field/tests/field_test/field_test.entity.inc
Validate handler for field_test_entity_form().
field_test_entity_nested_form_validate in core/modules/field/tests/field_test/field_test.entity.inc
Validate handler for field_test_entity_nested_form().
field_test_field_validate in core/modules/field/tests/field_test/field_test.field.inc
Implements hook_field_validate().
field_test_widget_multiple_validate in core/modules/field/tests/field_test/field_test.field.inc
Form element validation handler for 'test_field_widget_multiple' widget.
field_ui_field_edit_form_validate in core/modules/field_ui/field_ui.admin.inc
Form validation handler for field_ui_field_edit_form().
field_ui_field_overview_form_validate in core/modules/field_ui/field_ui.admin.inc
Form validation handler for field_ui_field_overview_form().
file_add_form_validate in core/modules/file/file.pages.inc
Validation handler for file_add_form().
file_managed_file_validate in core/modules/file/file.module
Render API callback: Validates the managed_file element.
file_manage_form_validate in core/modules/file/file.pages.inc
Form validation handler for file_manage_form().
file_settings_form_validate in core/modules/file/file.admin.inc
Validation handler for file_settings_form().
file_test_file_validate in core/modules/simpletest/tests/file_test.module
Implements hook_file_validate().
file_type_form_validate in core/modules/file/file.admin.inc
Form validation handler for file_file_type_form().
file_validate in core/includes/file.inc
Checks that a file meets the criteria specified by the validators.
filter_admin_format_filter_settings_form_redirect_validate in core/modules/filter/filter.admin.inc
Validation for filter "Configure" buttons in filter_admin_format_form().
filter_admin_format_form_validate in core/modules/filter/filter.admin.inc
Form validation handler for filter_admin_format_form().
filter_config_data_validate in core/modules/filter/filter.module
Implements hook_config_data_validate().
filter_format_editor_link_form_validate in core/modules/filter/filter.pages.inc
Validate handler for filter_format_editor_link_form().
form_example_phonenumber_combined_validate in modules/examples/form_example/form_example_elements.inc
Phone number validation function for the combined phonenumber.
form_example_phonenumber_discrete_validate in modules/examples/form_example/form_example_elements.inc
Validation handler for the discrete version of the phone number.
form_example_tutorial_10_validate in modules/examples/form_example/form_example_tutorial.inc
Validate handler for form_example_tutorial_10().
form_example_tutorial_6_validate in modules/examples/form_example/form_example_tutorial.inc
Validation handler for Tutorial 6.
form_example_tutorial_7_validate in modules/examples/form_example/form_example_tutorial.inc
Validation function for form_example_tutorial_7().
form_example_tutorial_8_next_validate in modules/examples/form_example/form_example_tutorial.inc
Validate handler for the next button on first page.
form_example_tutorial_9_validate in modules/examples/form_example/form_example_tutorial.inc
Validate function for form_example_tutorial_9().
form_example_wizard_location_info_validate in modules/examples/form_example/form_example_wizard.inc
Custom validation form for the 'location info' page of the wizard.
form_options_validate in core/modules/field/modules/options/options.module
Validate the "options" form element type.
form_test_clicked_button_validate in core/modules/simpletest/tests/form_test.module
Form validation handler for the form_test_clicked_button() form.
form_test_programmatic_form_validate in core/modules/simpletest/tests/form_test.module
Form validation handler for programmatic form submissions.
form_test_validate_form_validate in core/modules/simpletest/tests/form_test.module
Form validation handler for form_test_validate_form().
form_test_validate_select_element_validate in core/modules/simpletest/tests/form_test.module
An individual element validator used by form_test_validate_required_form().
html_datetime_validate in core/includes/form.inc
Validate a combined date and time array.
html_date_validate in core/includes/form.inc
Validate a date string.
html_time_validate in core/includes/form.inc
Validate a time string.
image_effect_color_validate in core/modules/image/image.admin.inc
Element validate handler to ensure a hexadecimal color value.
image_effect_scale_validate in core/modules/image/image.admin.inc
Element validate handler to ensure that either a height or a width is specified.
image_example_style_form_validate in modules/examples/image_example/image_example.pages.inc
Verifies that the user supplied an image with the form..
image_field_instance_settings_form_validate in core/modules/image/image.field.inc
Element validate handler for image_field_instance_settings_form().
image_style_form_add_validate in core/modules/image/image.admin.inc
Validate handler for adding a new image effect to an image style.
installer_manager_install_form_validate in core/modules/installer/installer.manager.inc
Form validation handler for installer_manager_install_form().
installer_manager_update_form_validate in core/modules/installer/installer.manager.inc
Form validation handler for installer_manager_update_form().
install_configure_form_validate in core/includes/install.core.inc
Form validation handler for install_configure_form().
install_settings_form_validate in core/includes/install.core.inc
Form validation handler for install_settings_form().
language_admin_add_custom_form_validate in core/modules/language/language.admin.inc
Validate the language addition form on custom language button.
language_admin_add_predefined_form_validate in core/modules/language/language.admin.inc
Element specific validator for the Add language button.
language_admin_edit_form_validate in core/modules/language/language.admin.inc
Validate the language editing form. Reused for custom language addition too.
language_negotiation_configure_url_form_validate in core/modules/locale/locale.admin.inc
Validation handler for url provider configuration.
layout_block_configure_form_validate in core/modules/layout/layout.admin.inc
Form validate handler for layout_block_configure_form().
layout_condition_add_form_validate in core/modules/layout/layout.admin.inc
Validation handler for layout_condition_add_form().
layout_content_form_validate in core/modules/layout/layout.admin.inc
Validate the layout settings form.
layout_context_add_form_validate in core/modules/layout/layout.context.admin.inc
Validation handler for layout_context_add_form().
layout_entity_admin_add_form_validate in core/modules/layout/layout.entity.admin.inc
Validate handler for the layout_entity_admin_add_form().
layout_flexible_template_edit_row_validate in core/modules/layout/layout.flexible.inc
Validation handler for layout_flexible_template_edit_row_form().
layout_settings_form_validate in core/modules/layout/layout.admin.inc
Validates layout_settings_form(), ensuring a valid path.
layout_settings_page_validate in core/modules/layout/layout.admin.inc
Validation for layout settings page.
link_field_element_validate in core/modules/link/link.module
Link field element validation.
link_field_settings_form_validate in core/modules/link/link.module
#element_validate handler for link_field_instance_settings_form().
link_field_validate in core/modules/link/link.module
Implements hook_field_validate().
list_allowed_values_setting_validate in core/modules/field/modules/list/list.module
Element validate callback; check that the entered values are valid.
list_field_validate in core/modules/field/modules/list/list.module
Implements hook_field_validate().
locale_translate_edit_form_validate in core/modules/locale/locale.pages.inc
Validate string editing form submissions.
locale_translation_filter_form_validate in core/modules/locale/locale.pages.inc
Validate result from locale translation filter form.
menu_edit_item_validate in core/modules/menu/menu.admin.inc
Validate form values for a menu link being added or edited.
menu_settings_form_validate in core/modules/menu/menu.admin.inc
Validate form values for the global settings form.
node_autocomplete_validate in core/modules/node/node.pages.inc
Node title validation handler.
node_config_create_validate in core/modules/node/node.module
Implements hook_config_create_validate().
node_config_delete_validate in core/modules/node/node.module
Implements hook_config_delete_validate().
node_form_validate in core/modules/node/node.pages.inc
Form validation handler for node_form().
node_hooks_example_node_validate in modules/examples/node_hooks_example/node_hooks_example.module
Implements hook_node_validate().
node_search_admin_validate in core/modules/node/node.module
Element validation callback for the search admin form.
node_search_validate in core/modules/node/node.module
Form validation handler for node_form_search_form_alter().
node_type_form_validate in core/modules/node/node.types.inc
Form validation handler for node_type_form().
node_validate in core/modules/node/node.module
Performs validation checks on the given node.
number_field_instance_settings_form_validate in core/modules/field/modules/number/number.module
Form validation handler for number_field_instance_settings_form().
number_field_validate in core/modules/field/modules/number/number.module
Implements hook_field_validate().
options_field_instance_settings_validate in core/modules/field/modules/options/options.module
Form #validate callback for field_ui_field_edit_form().
options_field_settings_validate in core/modules/field/modules/options/options.module
Form #validate callback for Field UI forms that use an options element.
options_field_widget_validate in core/modules/field/modules/options/options.module
Form element validation handler for options element.
password_confirm_validate in core/includes/form.inc
Validates a password_confirm element.
path_admin_form_validate in core/modules/path/path.admin.inc
Form validation handler for path_admin_form().
path_bulk_update_form_validate in core/modules/path/path.admin.inc
Validate handler for URL alias bulk generate form.
path_form_element_validate in core/modules/path/path.module
Form element validation handler for URL alias form element.
path_patterns_settings_form_validate in core/modules/path/path.admin.inc
Validate handler for path_patterns_settings_form().
redirect_edit_form_validate in core/modules/redirect/redirect.admin.inc
Form validate handler; validate an URL redirect
redirect_list_form_operations_validate in core/modules/redirect/redirect.admin.inc
Validate redirect_list_form form submissions.
redirect_validate in core/modules/redirect/redirect.module
Validate a redirect.
search_admin_settings_validate in core/modules/search/search.admin.inc
Form validation handler for search_admin_settings().
search_form_validate in core/modules/search/search.pages.inc
As the search form collates keys from other modules hooked in via hook_form_alter, the validation takes place in _submit. search_form_validate() is used solely to set the 'processed_keys' form value for the basic search form.
simpletest_settings_form_validate in core/modules/simpletest/simpletest.pages.inc
Validation handler for simpletest_settings_form().
system_logging_settings_validate in core/modules/system/system.admin.inc
Validates the submitted logging form.
system_modules_uninstall_validate in core/modules/system/system.admin.inc
Validates the submitted uninstall form.
system_site_information_settings_validate in core/modules/system/system.admin.inc
Validates the submitted site-information form.
taxonomy_autocomplete_validate in core/modules/taxonomy/taxonomy.module
Form element validate handler for taxonomy term autocomplete element.
taxonomy_config_create_validate in core/modules/taxonomy/taxonomy.module
Implements hook_config_create_validate().
taxonomy_field_validate in core/modules/taxonomy/taxonomy.module
Implements hook_field_validate().
taxonomy_form_term_validate in core/modules/taxonomy/taxonomy.admin.inc
Validation handler for the term form.
taxonomy_form_vocabulary_validate in core/modules/taxonomy/taxonomy.admin.inc
Form validation handler for taxonomy_form_vocabulary().
text_field_instance_settings_form_validate in core/modules/field/modules/text/text.module
Element validate handler for text_field_instance_settings_form().
text_field_validate in core/modules/field/modules/text/text.module
Implements hook_field_validate().
token_element_validate in core/includes/token.inc
Validate a form element that should have tokens in it.
translation_node_validate in core/modules/translation/translation.module
Implements hook_node_validate().
update_settings_validate in core/modules/update/update.admin.inc
Form validation handler for update_settings().
user_account_form_validate in core/modules/user/user.module
Form validation handler for user_account_form().
user_login_authenticate_validate in core/modules/user/user.module
Second phase validation handler on the login form.
user_login_final_validate in core/modules/user/user.module
The final validation handler on the login form.
user_login_name_validate in core/modules/user/user.module
First phase validation handler for the login form.
user_password_policy_validate in core/modules/user/user.module
Validation callback for password constraints.
user_pass_required_validate in core/modules/user/user.module
Element validate handler for the password field.
user_pass_validate in core/modules/user/user.pages.inc
Form validation handler for user_pass().
user_profile_form_validate in core/modules/user/user.pages.inc
Form validation handler for user_profile_form().
user_register_validate in core/modules/user/user.module
Validation function for the user registration form.
views_exposed_form_validate in core/modules/views/views.module
Validate handler for exposed filters
views_form_views_form_validate in core/modules/views/views.module
Validate handler for the first step of the views form. Calls any existing views_form_validate functions located on the views fields.
views_handler::exposed_validate in core/modules/views/includes/handlers.inc
Validate the exposed handler form
views_handler::expose_validate in core/modules/views/includes/handlers.inc
Validate the options form.
views_handler::extra_options_validate in core/modules/views/includes/handlers.inc
Validate the options form.
views_handler::options_validate in core/modules/views/includes/handlers.inc
Validate the options form.
views_handler_argument::options_validate in core/modules/views/handlers/views_handler_argument.inc
Validate the options form.
views_handler_field_bulk_form::options_validate in core/modules/views/handlers/views_handler_field_bulk_form.inc
Overrides views_handler::options_validate().
views_handler_field_serialized::options_validate in core/modules/views/handlers/views_handler_field_serialized.inc
Validate the options form.
views_handler_filter::build_group_validate in core/modules/views/handlers/views_handler_filter.inc
Validate the build group options form.
views_handler_filter::expose_validate in core/modules/views/handlers/views_handler_filter.inc
Validate the options form.
views_handler_filter::operator_validate in core/modules/views/handlers/views_handler_filter.inc
Validate the operator form.
views_handler_filter::options_validate in core/modules/views/handlers/views_handler_filter.inc
Simple validate handler
views_handler_filter::value_validate in core/modules/views/handlers/views_handler_filter.inc
Validate the options form.
views_handler_filter_boolean_operator::value_validate in core/modules/views/handlers/views_handler_filter_boolean_operator.inc
Validate the options form.
views_handler_filter_date::build_group_validate in core/modules/views/handlers/views_handler_filter_date.inc
Validate the build group options form.
views_handler_filter_date::exposed_validate in core/modules/views/handlers/views_handler_filter_date.inc
Validate the exposed handler form
views_handler_filter_date::options_validate in core/modules/views/handlers/views_handler_filter_date.inc
Simple validate handler
views_handler_filter_search::exposed_validate in core/modules/search/views/views_handler_filter_search.inc
Validate the options form.
views_handler_filter_term_node_tid::exposed_validate in core/modules/taxonomy/views/views_handler_filter_term_node_tid.inc
Validate the exposed handler form
views_handler_filter_term_node_tid::value_validate in core/modules/taxonomy/views/views_handler_filter_term_node_tid.inc
Validate the options form.
views_handler_filter_user_name::exposed_validate in core/modules/user/views/views_handler_filter_user_name.inc
Validate the exposed handler form
views_handler_filter_user_name::value_validate in core/modules/user/views/views_handler_filter_user_name.inc
Validate the options form.
views_handler_sort::options_validate in core/modules/views/handlers/views_handler_sort.inc
Simple validate handler
views_handler_sort::sort_validate in core/modules/views/handlers/views_handler_sort.inc
views_plugin::options_validate in core/modules/views/includes/plugin.inc
Validate the options form.
views_plugin_access::options_validate in core/modules/views/plugins/views_plugin_access.inc
Provide the default form form for validating options
views_plugin_access_role::options_validate in core/modules/views/plugins/views_plugin_access_role.inc
Provide the default form form for validating options
views_plugin_argument_default::options_validate in core/modules/views/plugins/views_plugin_argument_default.inc
Provide the default form form for validating options
views_plugin_argument_validate::options_validate in core/modules/views/plugins/views_plugin_argument_validate.inc
Provide the default form form for validating options
views_plugin_cache_time::options_validate in core/modules/views/plugins/views_plugin_cache_time.inc
Validate the options form.
views_plugin_display::options_validate in core/modules/views/plugins/views_plugin_display.inc
Validate the options form.
views_plugin_display_extender::options_validate in core/modules/views/plugins/views_plugin_display_extender.inc
Validate the options form.
views_plugin_display_page::options_validate in core/modules/views/plugins/views_plugin_display_page.inc
Validate the options form.
views_plugin_exposed_form::exposed_form_validate in core/modules/views/plugins/views_plugin_exposed_form.inc
views_plugin_pager::exposed_form_validate in core/modules/views/plugins/views_plugin_pager.inc
views_plugin_pager::options_validate in core/modules/views/plugins/views_plugin_pager.inc
Provide the default form form for validating options
views_plugin_pager_full::exposed_form_validate in core/modules/views/plugins/views_plugin_pager_full.inc
views_plugin_pager_full::options_validate in core/modules/views/plugins/views_plugin_pager_full.inc
Provide the default form form for validating options
views_plugin_query::options_validate in core/modules/views/plugins/views_plugin_query.inc
Validate the options form.
views_plugin_row::options_validate in core/modules/views/plugins/views_plugin_row.inc
Validate the options form.
views_plugin_style::options_validate in core/modules/views/plugins/views_plugin_style.inc
Validate the options form.
views_ui_config_item_extra_form_validate in core/modules/views_ui/views_ui.admin.inc
Validation handler for configing new item(s) to a view.
views_ui_config_item_form_validate in core/modules/views_ui/views_ui.admin.inc
Submit handler for configing new item(s) to a view.
views_ui_edit_display_form_validate in core/modules/views_ui/views_ui.admin.inc
Validate handler for views_ui_edit_display_form
views_ui_edit_view_form_validate in core/modules/views_ui/views_ui.admin.inc
Validate that a view is complete and whole.
views_ui_taxonomy_autocomplete_validate in core/modules/views_ui/views_ui.admin.inc
Form element validation handler for a taxonomy autocomplete field.
views_ui_wizard_form_validate in core/modules/views_ui/views_ui.admin.inc
Validate the add view form.