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I already gone through some question in StackOverflow regarding this but nothing helped much in my case.
I want to restrict the user to provide a filename that should contain only alphanumeric characters, -, _, . and space.
I'm not good in regular expressions and so far I came up with this ^[a-zA-Z0-9.-_]$. Can somebody help me?
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Supported characters for a file name are letters, numbers, spaces, and ( ) _ - , . *Please note file names should be limited to 100 characters. Characters that are NOT supported include, but are not limited to: @ $ % & \ / : * ?
Special Regex Characters: These characters have special meaning in regex (to be discussed below): . , + , * , ? , ^ , $ , ( , ) , [ , ] , { , } , | , \ . Escape Sequences (\char): To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "."
This is the correct expression:
string regex = @"^[\w\-. ]+$"; \w is equivalent of [0-9a-zA-Z_].
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