SearchQuery::parseSearchExpression in core/modules/search/search.extender.inc

Parses the search query into SQL conditions.

SearchSimplifyTestCase::testSearchSimplifyPunctuation in core/modules/search/tests/search.test

Tests that search_simplify() does the right thing with punctuation.

SearchSimplifyTestCase::testSearchSimplifyUnicode in core/modules/search/tests/search.test

Tests that all Unicode characters simplify correctly.

SearchTokenizerTestCase::testNoTokenizer in core/modules/search/tests/search.test

Verifies that strings of non-CJK characters are not tokenized.

SearchTokenizerTestCase::testTokenizer in core/modules/search/tests/search.test

Verifies that strings of CJK characters are tokenized.

search_index_split in core/modules/search/search.module

Simplifies and splits a string into tokens for indexing.

search_simplify_excerpt_match in core/modules/search/search.module

Find words in the original text that matched via search_simplify().