One of the reasons that a regular expression might be inefficient is that it would compile every time that it was checked. To save the time of doing that you might want to try the 'o' modifier. This modifier will compile the pattern only once. Since you have no variable interpolation you can get away with this. So the regex would look like this: 
$test_char =~ /^[A-Z]$/o;

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Try using that as the regex and then see how fast it is. - kel -

In reply to Re: Testing a string for a range of characters by dsb
in thread Testing a string for a range of characters by BoredByPolitics

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