Regular expression functions
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* array preg_grep_ ( array *$subject*, string *$pattern* )
* bool preg_has_match_ ( string *$subject*, string *$pattern* )
* array preg_match_ ( string *$subject*, string *$pattern* )
* string preg_quote_ ( *$str*, [, string *$delim*] )
* string preg_replace_ ( string *$subject*, string *$pattern*, string *$replace* [, int *$limit*] )
* array preg_split_ ( string *$subject*, string *$pattern* )