function search_simplify in Drupal 4

Same name and namespace in other branches

1. 8 core/modules/search/search.module \search_simplify()
2. 5 modules/search/search.module \search_simplify()
3. 6 modules/search/search.module \search_simplify()
4. 7 modules/search/search.module \search_simplify()
5. 9 core/modules/search/search.module \search_simplify()

Simplifies a string according to indexing rules.

2 calls to search_simplify()

search_index_split in modules/search.module

Splits a string into tokens for indexing.

search_parse_query in modules/search.module

Parse a search query into SQL conditions.

File

modules/search.module, line 332

Enables site-wide keyword searching.

Code

function search_simplify($text) {

  // Decode entities to UTF-8
  $text = decode_entities($text);

  // Lowercase
  $text = drupal_strtolower($text);

  // Call an external processor for word handling.
  search_preprocess($text);

  // Simple CJK handling
  if (variable_get('overlap_cjk', true)) {
    $text = preg_replace_callback('/[' . PREG_CLASS_CJK . ']+/u', 'search_expand_cjk', $text);
  }

  // To improve searching for numerical data such as dates, IP addresses
  // or version numbers, we consider a group of numerical characters
  // separated only by punctuation characters to be one piece.
  // This also means that searching for e.g. '20/03/1984' also returns
  // results with '20-03-1984' in them.
  // Readable regexp: ([number]+)[punctuation]+(?=[number])
  $text = preg_replace('/([' . PREG_CLASS_NUMBERS . ']+)[' . PREG_CLASS_PUNCTUATION . ']+(?=[' . PREG_CLASS_NUMBERS . '])/u', '\\1', $text);

  // The dot, underscore and dash are simply removed. This allows meaningful
  // search behaviour with acronyms and URLs.
  $text = preg_replace('/[._-]+/', '', $text);

  // With the exception of the rules above, we consider all punctuation,
  // marks, spacers, etc, to be a word boundary.
  $text = preg_replace('/[' . PREG_CLASS_SEARCH_EXCLUDE . ']+/u', ' ', $text);
  return $text;
}