Regular expression validating url

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These expressions are definitely very useful and come up time and time again in the tasks of any developer.I hope the descriptions of how they function are of use in deciphering the details of each of these two expressions.DOTALL is a flag in most recent regex libraries that makes the . There is no 100% reliable solution since the RFC is way too complex. ] )*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_] )*\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])|([0-9]\.[0-9]\.[0-9]\.[0-9]))(:[0-9])? $ This will make sure that every number in the IP address is between 0 and 255, unlike the version using \d which would allow for 999.999.999.999.

This makes sure that extra text will not be included in valid matches. com / mysearch / as an example; here are how the regular expression matches this URL: ^[a-z A-Z0-9._-] @[a-z A-Z0-9.-] \.[a-z A-Z]$ This expression checks for valid email address syntax such as [email protected] with the URL validation expression above, this email expression uses the ^ symbol to match the start of a line and the $ symbol to match the end.Make sure to be in global mode (g flag), case insensitive and to have the dot all option on.This regular expression will match all HTML tags and their attributes.Also, next time, you might want to include the programming language or context, because regex processors vary greatly in feature support. I developed this by little trial and error and covers u r scenario....

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