C regex for validating url
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.
metacharacter match anything INCLUDING line breaks. Java Script by default does not support this since the . This is the best solution and should work 99% of the time is. If you want to match an IP within a string, get rid of the leading ^ and trailing $ to use \b (word boundaries) instead. The regular expression is only useful to validate the format of the date as entered by a user.
In the following example, I am showing an email validation in various ways.
Suppose we want to extract a domain name and user name from an email id, then by using the following method we can do it.
Using C#: We need to make a group inside an expression using ( ) characters and extract that group value using the preceding process. Summary In this illustration you came to understand the various types of regular expressions and their uses.
[email protected] – “.a” is not a valid tld, last tld must contains at least two characters 4. mkyong()*@– email’s is only allow character, digit, underscore and dash 8.
[email protected]– email’s first character can not start with dot “.” 7.
Looking closer on another day, I found a site run by Jeff Roberson where he had meticulously worked through RFC-3896, constructing simple regular expressions then combining them to create a full regular expression that should properly parse any valid URL.
Note that the standard allows much of what we think of as necessary information to be empty.
Consult the regular expression documentation or the regular expression solutions to common problems section of this page for examples. You can create range of characters using the hyphen character such as A-Z (A to Z).
If you need more examples or solutions, please contact me. Note that in character sets, special characters (., *, ) do not have any special meaning. This means match anything that is a single white space character OR anything that is not a white space character!
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