Regular expression issue for validating input

Question

I have this requirement for checking characters, numbers, and a few special characters from a given user input. The input may have AZ, az, 0-9,.,? And>. It must not have any other special character.

If there is one entrance, he should stop there and make another staff. I tried to write a regular expression like this (below), but it always gives false information - I don't know what is missing:

string[] vals = allParams.Split(':'); Regex rgx = new Regex(@"^[a-zA-Z0-9?>.]$"); foreach (string value in vals) { string result = rgx.IsMatch(value).ToString(); if (result == "False") return; } 

Answer 1

Regular expression added:

 "^[a-zA-Z0-9?>.]$" 

Matches a single character between the beginning and end of a line.

The following will look for one or more of the following characters:

 "^[a-zA-Z0-9?>.]+$" 

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Note - regarding your bool rotation. This is the best way to do this:

 bool result = rgx.IsMatch(value); if (!result) return; 

Or, even shorter:

 if(!rgx.IsMatch(value)) return;