From: Greg Millam <walker@...>
Date: 2002-12-19T13:38:23+09:00
Subject: Re: How to include some text and exclude other in one regular expression?

On Thu, 19 Dec 2002, Usano wrote:

> I would like to match "file 1 of 2" or "1 of 2", but not "day 1 of 2".
>
> I can match "file 1 of 2" with...
>
> 	/(file)? *\d+ *of *\d+/
>
> I wonder if (in the same regex), I can prevent a match to "day 1 of
> 2"?  The above expression will match this by just ignoring the word
> "day".
>
> Can this be done?

/^(file)?\s*(\d+)\s*of\s*(\d+)$/

\s is any white space character.
adding ^ and $ to the beginning and end of the expression make it match
the entire string. since /1 or 2/ will match "day 1 or 2" "file 1 or 2" or
"In 2002, 1 or 2 people answered this email"
/^1 or 2$/ makes it match only "1 or 2", with nothing before or after.

Hope this helps,
Greg.

>
> Thank you,
>    - Usano
>

--
Greg Millam
walker at deafcode.com