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

$ perl -le 'print "hello_world" =~ /^\w+$/ ? "OK" : "BAD"' OK ---> underscore is considered alphanumeric character.
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Underscore is not considered an alphanumeric character. It is considered a word character (hence the \w character class.)

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Re^3: check if string contains anything other than alphanumeric by naikonta (Curate) on Aug 12, 2007 at 14:08 UTC
It's said that `\w` matches a 'word' character (alphanumeric plus '_'), so I should have said that "underscore is considered part of that character class". Thank you, jwkrahn. Open source softwares? Share and enjoy. Make profit from them if you can. Yet, share and enjoy!	[reply] [d/l]