function
| Library: Regular expressions (OMREGEX) Import : omregex.xmd | Returns: parsed regular expression | 
export regexp function
   parse value string expression
    
Use parse to parse and compile a regular expression string before you
      can try to match input against it.
      
 If the regular expression is invalid and cannot be parsed, parse throws
        the parse-error exception. The syntax of valid regular expressions
        is specified by the W3C XML Schema Datatypes specification.