Re^2: check if string contains anything other than alphanumeric

Yup, ur right. lol, sorry. I was typing very fast and did not even realize it. this did work though:

if ($value =~ m/[^a-zA-Z0-9]/) {
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So thank you very much!!!

I do have a question though, why does that work, since it is not !~ and is =~?

Oh well, it does work and that is all that matters!

Thanks again.

Comment on Re^2: check if string contains anything other than alphanumeric Download Code

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Re^3: check if string contains anything other than alphanumeric by FunkyMonk (Bishop) on Aug 12, 2007 at 09:05 UTC
If a character class starts with `^`, it is a negated character class. That is, it will match any character that is not in the class. So, `/[^a-zA-Z0-9]/` will match any character that is not a letter or digit. See perlretut for a tutorial on regexps and perlre for the details. update: My 200^th node :)	[reply] [d/l] [select]
Re^3: check if string contains anything other than alphanumeric by naikonta (Curate) on Aug 12, 2007 at 09:41 UTC
I do have a question though, why does that work, since it is not !~ and is =~? It reads more or less "it's true if the string contains (`=~`) something other (`^`) than letters and numbers (`a-zA-Z0-9`)", so it works. You can of course use `!~` as well, to say "it's true if the string doesn't contains (`!~`) one or more letters and numbers (`[a-zA-Z0-9]+`) in its entirety (hence the `^` and `$` that constitutes the start and end marks). `print "bad string: $string\n" if $string !~ /^[a-zA-Z0-9]+$/;` [download] which I prefer to write (yes back to `=~` and not `!~`): `print "bad string: $string\n" unless $string =~ /^[a-zA-Z0-9]+$/;` [download] Open source softwares? Share and enjoy. Make profit from them if you can. Yet, share and enjoy!	[reply] [d/l] [select]