(@"^\w+(?: \w+){0,8}$"
the above regular expression restrict all the special characters except _ . how would i restrict it.
(@^\w+(?: \w+){0,8}$ the above regular expression restrict all the special characters except _ .
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(@"^\w+(?: \w+){0,8}$"
the above regular expression restrict all the special characters except _ . how would i restrict it.
Use
to allow everything that
\wmatches except_.\Wmeans “any character that isn’t matched by\w“, so by putting it into a negated character class and adding a_to that class, we’re effectively subtracting_from\w.*In other words,
[^\W_]means “match any character that is neither a non-alphanumeric character nor an underscore”.Another way (perhaps more explicit and easier to understand) would be to use Unicode properties:
where
[\p{L}\p{N}]means “any Unicode letter or number”.*In .NET, the
\wshorthand matches a lot more than[A-Za-z0-9_], especially international (non-ASCII) letters.