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I want to validate an email address with Regex in C#.
I'm using this pattern:
^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$
This pattern only matches upper case letters. For example:
"[email protected]" --> returns false. "[email protected]" --> returns true.
I obviously would like that the first example will also return true.
NOTE: I DON'T want to use the RegexOptions.IgnoreCase flag.
I would like to change the pattern itself to match the first example. I think that I can add a "/i" in the end of the pattern or something like this but it doesn't seems to work. I prefer not to use the "?i" in the beginning as well.
How can i achieve this?
(If you could rewrite the whole pattern for me, it would be great!).
Thanks.
477
(? i) makes the regex case insensitive.
By default, the comparison of an input string with any literal characters in a regular expression pattern is case-sensitive, white space in a regular expression pattern is interpreted as literal white-space characters, and capturing groups in a regular expression are named implicitly as well as explicitly.
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "." ; regex \+ matches "+" ; and regex \( matches "(" . You also need to use regex \\ to match "\" (back-slash).
Discussion. Currently, REGEXP is not case sensitive, either.
Instead of just [A-Z], use [A-Za-z].
But watch out: there are e-mail addresses that end in top-level domains like .travel, that are forbidden according to your regex!
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