Mastering Regular Expressions
As this book shows, a command of regular expressions is an invaluable skill. Regular expressions allow you to code complex and subtle text processing that you never imagined could be automated. Regular expressions can save you time and aggravation. They can be used to craft elegant solutions to a wide range of problems. Once you've mastered regular expressions, they'll become an invaluable part of your toolkit. You will wonder how you ever got by without them.
Corhol on 11/20/06
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Published in: Regular Expression
Matches any hex value (0123456789ABCDEF) preceded by the pound sign (#) of exactly 3 or 6 digits in length.
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I don't think that's the same thing, priyanhere. From the perlre manpage:
{n,m} Match at least n but not more than m times
Thus your example would also match 4 or 5 digits. Since we're looking for exactly 3 or 6, and those happen to be multiples, you could try this:
This is good, but below is more efficient /(#([0-9A-Fa-f]{3,6})\b)/