regular expression

I am looking for help on a PERL regular expression that can do the
following:

1. Make sure that the string is 20 chars or else match should fail.
2. The string can have word characters or spaces or comma(,), hyphen(-),
ampersand(&) characters.
3. If the string contains only spaces, then match should fail.

Any ideas on how this can be done using just one regular expression ?


Thanks.

*************************************************************************
This communication, including attachments, is
for the exclusive use of addressee and may contain proprietary,
confidential and/or privileged information. If you are not the intended
recipient, any use, copying, disclosure, dissemination or distribution is
strictly prohibited. If you are not the intended recipient, please notify
the sender immediately by return e-mail, delete this communication and
destroy all copies.
*************************************************************************

Relevant Pages

  • Re: Get regular expression
    ... own tree structure. ... Expression compares a string character-by character, ... regular expression solution, which was about as close as one could get to ... the structure of the hierarchy can be inferred by using ...
    (microsoft.public.dotnet.languages.csharp)
  • Re: Get regular expression
    ... regular expression solution, which was about as close as one could get to ... first string. ... explode "ABLATION" and see subnodes of "ENDOMETRIAL ... "Heart 27.33/2" ...
    (microsoft.public.dotnet.languages.csharp)
  • Re: Regular expression optimization
    ... position in the replacement array of strings, ... > input string and a MatchEvaluator delegate. ... > The first part required combining the separate Regular Expression strings ...
    (microsoft.public.dotnet.general)
  • Re:
    ... > patterns to split a string. ... > It is odd about the help files, after I figure out how to do something, the ... > distribution or copying of this communication is strictly prohibited. ...
    (comp.lang.python)
  • Small regular expression parser
    ... the goal was to develop a very simple regular expression parser. ... sets are selected using the % character instead of \. ... into the string of the start of the match and the length of the match. ... Last there are a couple macros to help with captures. ...
    (comp.lang.lisp)