Trouble with '$' matching end of string

I've got this regular expression:

/^(:([^\x00 \r\n]+) )?(([a-zA-Z]+)|(\d{3}))((( ([^:\x00 \r\n][\x00
\r\n]*)){0,13})( :([^\x00\r\n]*))?)$/

This regular expression should match the following string:

:[email protected] USER xxxx 0 * :Name to user


However, the regular expression does not match the string, but if I remove
the '$' at the end it does match it.  Has anyone else had this problem, or
is this a fluke?


Brad Handy