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# __construct()
 -  throws an RuntimeException if you don't pass a pattern option
# ->clean()
 -  checks that the value match the regex
 -  throws an sfValidatorError if the value does not match the pattern
 -  throws a sfValidatorError
 -  checks that the value does not match the regex if must_match is false
 -  throws an sfValidatorError if the value matches the pattern if must_match is false
 -  throws a sfValidatorError
 -  uses the pattern returned by a sfCallable pattern option
# ->asString()
 -  returns a string representation of the validator
# ->getPattern()
 -  returns the regular expression
 -  returns a regular expression from a sfCallable
# Looks like everything went fine.