Description
string 
sql_regcase ( string string )
     Returns a valid regular expression which will match
     string, ignoring case. This expression is
     string with each alphabetic character converted to a
     bracket expression; this bracket expression contains that
     character's uppercase and lowercase form.  Other characters remain unchanged.
    
     
Example 1. sql_regcase() example 
<?php echo sql_regcase("Foo - bar."); ?>
 |  
 The above example will output: [Ff][Oo][Oo] - [Bb][Aa][Rr].  |  
  | 
    
     This can be used to achieve case insensitive pattern matching in
     products which support only case sensitive regular expressions.