CODEWITHSUNDEEP
c#regex
TheAnonyMoose1234512
TheAnonyMoose1234512

Reputation: 169

Regex to match all alphanumeric and math operators

I have the simple regex @"[a-zA-Z]" to match all characters a-z in a string but I also need math operators (*, /, +, -). I was reading over the documentation on msdn but I got lost relatively fast due to the math operators being used as other tokens in the regex

This solution works:

 @"[A-Za-z\*\+\-\/]"

Thanks for the help and resources everyone.

Upvotes: 3

Views: 3388

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626802

The correct answer is

@"[A-Za-z*+/-]"

Or @"[A-Za-z-*+/]", or @"[-A-Za-z*+/]", or @"[A-Za-z*\-+/]".

Or, shorten it with a case-insensitive modifier: @"(?i)[A-Z*+/-]" (or use a corresponding RegexOptions.IgnoreCase with @"[A-Z*+/-]" since it seems you are using C#).

Inside a character class, the unescaped hyphen should either be at the start or final position to be treated as a literal, or right after a range or shorthand class. Otherwise, it must be escaped. Also, ] must be escaped if not at the beginning of the character class. Other characters do not have to be escpaed inside a character class.

To test, use an appropriate online regex tester. You need one for .NET, see Regex demo at RegexStorm.

Upvotes: 3

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