Regex is not working

Question

0.00/5 (No votes)

See more:

C#

I need to write a regex for below scenario:
First four characters must be letters including "Ñ" or "&".
Next two characters must be digits.
Next character must be 0 or 1.
Next character must be digit.
Next two characters must be from 01 to 31.

I have a regex, but this is failing:
var regexTenCharacter = new RegExp("[A-Za-zÑ&]{4}[0-9]{2}[0|1]{1}[0-9]{1}[0-3]{1}[0-9]{1}$");

Please provide a workaround for this.

What I have tried:

var regexTenCharacter = new RegExp("[A-Za-zÑ&]{4}[0-9]{2}[0|1]{1}[0-9]{1}^(3[01]|[12][0-9]|[1-9])$");

Posted 19-May-16 12:23pm

narein4u

Updated 19-May-16 13:31pm

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Matt T Heffron · Answer 1 · 2016-05-19T13:31:00

Your regex looks awfully close. Try:

JavaScript

var regexTenCharacter = new RegExp("^[A-Za-zÑ&]{4}\d{2}[01]\d(?:(?:0[1-9])|(?:[12]\d)|3[01])$");

All of the {1} are unnecessary since exactly 1 occurrence of an item is the default.
You had [0|1] where all you wanted was [01].
What you had would match any of the three characters: 0 1 | (vertical bar)
Your handling at the end would have allowed any 2 digit number from 00-39.
It needs to be a bit more specific, piecewise, to get the range you want.

There's also Expresso[^] for building and testing regular expressions.

Also, you said that what you had was failing but you weren't specific about what was wrong. You should always be as specific as possible describing your errors.

Patrice T · Answer 2 · 2016-05-19T12:48:00

To test RegEx, I use these sites
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]
.NET Regex Tester - Regex Storm[^]
In both you can paste a RegEx and some data and see what match.
The first one also show your RegEx as a diagram that show you what does the expression. By using a cursor, you can see the matching progress in regEx and data at same time. So you can see where it fail and why.

-Did you try to remove the '$' ?

Regex is not working

2 solutions

Solution 2

Solution 1

Add your solution here

Preview 0