===== Perl Compatible Regular Expressions =====

  * [[Pattern Modifiers]]
  * [[Pattern Syntax]]
  * [[preg_grep]]
  * [[preg_last_error]]
  * [[preg_match_all]]
  * [[preg_match]]
  * [[preg_quote]]
  * [[preg_replace_callback]]
  * [[preg_replace]]
  * [[preg_split]]

===== POSIX Extended Regular Expressions =====

  * [[ereg_replace]]
  * [[ereg]]
  * [[eregi_replace]]
  * [[eregi]]
  * [[split]]
  * [[spliti]]
  * [[sql_regcase]]