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Recently programming in PHP, I thought I had a working Perl regular expression but when I checked it against what I wanted, it didn't work.
What is the right expression to check if something is a MD5 has (32 digit hexadecimal of a-z and 0-9).
Currently, I have /^[a-z0-9]{32}$/i
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The Special Character Classes in Perl are as follows: Digit \d[0-9]: The \d is used to match any digit character and its equivalent to [0-9]. In the regex /\d/ will match a single digit. The \d is standardized to “digit”.
Use /m , /s , or both as pattern modifiers. /s lets . match newline (normally it doesn't). If the string had more than one line in it, then /foo. *bar/s could match a "foo" on one line and a "bar" on a following line.
As of Perl 5.10, PCRE is also available as a replacement for Perl's default regular-expression engine through the re::engine::PCRE module. The library can be built on Unix, Windows, and several other environments.
MD5:
/^[0-9a-f]{32}$/i
SHA-1:
/^[0-9a-f]{40}$/i
MD5 or SHA-1:
/^[0-9a-f]{32}(?:[0-9a-f]{8})?$/i
Also, most hashes are always presented in a lowercase hexadecimal way, so you might wanna consider dropping the i modifier.
By the way, hexadecimal means base 16:
0 1 2 3 4 5 6 7 8 9 A B C D E F = base 16
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 = base 10
So as you can see it only goes from 0 to F, the same way decimal (or base 10) only goes from 0 to 9.
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