CODEWITHSUNDEEP
c#regex
PSR
PSR

Reputation: 893

Regex for integer in the word not failing properly

I am trying to create regex to exactly match one string format. The strings will be like this

A3476,TextA
B5628,TextB
A9871,TextC

The first character should be either 'A' or 'B' and it will follow integer number which should be exactly 4 chars in length and followed by ','. After comma only Three words will repeate those are either 'TextA' or 'TextB' or 'TextB'.

I have tried this regex

(A|B)(\d{4})(,)(TextA|TextB|TextC)

When I add any alphabet in the integer number or integer number is greater than 4 chars in length the string match should fail but it is not failing.

Suppose if the string is like this

A653k7876,TextA

I am getting result like this 7876,TextA. The result is missing character 'A' and reading integer from end. My intention is it should fail.

Upvotes: 1

Views: 62

Answers (3)

Lanorkin
Lanorkin

Reputation: 7524

Looks like we need more info, as if I use strings exactly as you provided they work fine:

Console.WriteLine(Regex.IsMatch(@"A653k7876,TextA", @"(A|B)(\d{4})(,)(TextA|TextB|TextC)"));

outputs False - as you want.

Upvotes: 0

Daniel A.A. Pelsmaeker
Daniel A.A. Pelsmaeker

Reputation: 50346

Your regex is fine, except that you should indicate where it should start and end with the match. The ^ special character indicates the start of a line or string, and $ the end. So, try this instead:

^(A|B)(\d{4})(,)(TextA|TextB|TextC)$

Make sure you specify RegexOptions.Multiline when creating the Regex object to make this work.

Upvotes: 1

Vimal Stan
Vimal Stan

Reputation: 2005

Use:

\b(A|B)(\d{4}),(TextA|TextB|TextC)\b

\b denotes the word boundary

You might find this link useful: C# Regex Cheat Sheet

Upvotes: 0

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