From: Tim Greer <tim@...>
Date: 2009-01-07T09:20:10+09:00
Subject: Re: Simple Regexp help

Joe Blow wrote:

> How can I test a word to make sure it ONLY contains certain
> characters?
> 
> Say i have an expression like /[A-Z]/i
> 
> How could i have "Testing" pass but "Testing123" fail?
> 
> PS. I can not dynamically create the expression so it looks like this
> /[A-Z{10}]/

If you only want a-z, set the character class to start and end the
string, otherwise it'll match anything with a character that's in the
alphabet, regardless of what follows it.  I.e., /^[a-z]+$/i will only
match a-z characters from start to end.  You can then change the
character class to whatever you wish.  ^ is the start of the string and
$ is the end of the string. + is one or more characters, so ^[a-z]+$ is
one of more characters in the character class [], being a-z, and noting
else. 
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