validate a string only if the condition meets in regex C#

Question

I am trying to create a Regex for a string where following rule is applied

I need to validate the string only if first 1-3 characters (it can be 1 char,2 char or 3 char ) are numeric and after that it has a '/' symbol character
If the 1st condition meets then i need to check whether the characters after that '/' should be any one of the following chars only ('ADD.','MOD.'), if not it should fail
If the 1st condition doesnot meets then it should not validate the string.

i tried with this regex but i am not able to get the solution.

(?=^[0-9]{1,3}[/]{1})^[0-9]{1,3}[/]{1}[(ADD.|MOD.)]{4}|(.*)

the condition doesnot fails when i validate a string - '123/testing' it should fail

Please let me know what i am missing.

Kind Regards, D.Mahesh

Amit Joki · Accepted Answer · 2014-04-09 15:12:23Z

2

Why don't you use this regex:

^\d{0,3}/(ADD\.|MOD\.)

Like this:

string regex = @"^\d{0,3}/(ADD\.|MOD\.)";

edited Apr 9, 2014 at 15:12

answered Apr 9, 2014 at 15:07

Amit Joki

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4 Comments

Ish Tech Over a year ago

hi amit just modified the question

Ish Tech Over a year ago

the starting char can be any numeric char and it can be 1/ or 34/ or 980/ if is satisifies this condition then i need to check rest of characters otherwise i donot need to check rest of the characters in the string

Ish Tech Over a year ago

thnx for ur prompt reply and help i tried ur regex with the following examples but still no luck -123/test 6/MOD.1test 126/MOD.1test 60/MOD.1test abc/MOD.1test 60MOD.1test 6/MOD1 12ts/ADD. i am testing with regexlib tester in the above example s all are valid string only 123/test is an invalid string

Ish Tech Over a year ago

i tried with regex still no results i think somewhere i am making mistake in using conditional regex

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