I have the following regular expression in a asp.net email test box:
([a-zA-Z0-9_\-\.]+)\@((base\.co\.uk)|(base\.com)|(group\.com)|(arg\.co\.uk)|(arggroup\.com))
This regular expression only works for
[email protected]
[email protected]
[email protected]
It's not working for:
[email protected]
[email protected]
Please help me
Although I didn't get to the exact problem, You missed/overlooked an important point here. :-)
'.' is a wild card in regex, it matches anything.
to match '.' use
\.
lets try this
([a-zA-Z0-9_\-.]+)@(base\.co\.uk)|(base\.com)|(group\.com)|(arg\.co\.uk)|(arggroup\.com)
This:
[a-zA-Z0-9_-.]
contains a bogus range, underscore to dot. Did you mean "underscore, dash or dot" like this:
[a-zA-Z0-9_\-.]
? Once I fix that, it works for me.
You should also use \. rather than . in the addresses - dot matches any character, so you'd match baseXcom with your pattern. (Note that you don't need a backslash for dots within []s.)
The full corrected expression:
@"([a-zA-Z0-9_\-.]+)@((base\.co\.uk)|(base\.com)|(group\.com)|(arg\.co\.uk)|(arggroup\.com))"
(note that I'm using @"" to avoid having to backslash my backslashes.)
Using the regular expression tester here will probably help you. However, as far as I can see, there's an error in the regular expression that should prevent it from working with any of the examples: the group should be:
[-a-zA-Z0-9_.]
With that fix, it works with all of your examples. Having the - between the _ and the . tries to construct a range, but the ASCII values are in the wrong order.
Also the dot used in the end part should be escaped as base\.com rather than base.com