c# string Regex that finds digits

Question

3.00/5 (2 votes)

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Hello, I`m having problems with Regex.
I have a line

Contract Nr.123456,reg.Nr.654321-118

I want to use a regex that Finds only the string 123456, but doesnt find the second 6 digit- 3 digit string(654321-118)

This is what i came up with, but dont really know what to do next

C#

string regex4 = @"\d{4,6}[^-]";

Any Ideas?
Thank you.

Posted 30-Jun-13 11:14am

Soloveikok

Updated 30-Jun-13 11:33am

Maciej Los

v2

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Comments

Zoltán Zörgő 30-Jun-13 17:36pm

Well, if the comma is specific, use it:
@"(\d{4,6}),";

Soloveikok 30-Jun-13 17:38pm

the comma isnt specific, I think I need to build the regex so It didnt find strings that end with the "-" sign

Zoltán Zörgő 30-Jun-13 17:43pm

Ok, but comma is no "-" either. So you need something more specific. Is it the first number in the line?

Soloveikok 30-Jun-13 17:57pm

This is payment details in the bank,field-recievers info. There are two possible sets of digits xxxxxx and xxxxxx-xxx, I need to find only the first one.

2 solutions

Solution 1

If you don't know what to do next, please, visit these links:
How to: Search Strings Using Regular Expressions (C# Programming Guide)[^]
C# Regex.Match examples[^]
Regular Expressions Usage in C#[^]
The 30 Minute Regex Tutorial[^]

Posted 30-Jun-13 11:38am

Maciej Los

Comments

Espen Harlinn 30-Jun-13 17:45pm

Nice set of links :-D

Maciej Los 30-Jun-13 17:53pm

Thank you, Espen ;)

Soloveikok 30-Jun-13 17:55pm

Thats proboly how you got those 61.8k posts, by spamming links. Do you think I didnt go throo google before writing here, jesus If you dont want to helpme just dont.

Maciej Los 30-Jun-13 18:14pm

Where are your manners? Do you want to be reported as a Abusive/Troll?

Don't forget to be more specific if you want to get detailed answer.

Soloveikok 1-Jul-13 2:02am

Sorry, that was late night and I was stuck with that regex for a while.

Sergey Alexandrovich Kryukov 30-Jun-13 20:26pm

Fair enough, a 5.
—SA

Maciej Los 1-Jul-13 11:20am

Thank you, Sergey ;)

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Valery Possoz · Accepted Answer · 2013-06-30T12:13:00

Hello,

You need to look at the regex pattern x(?!y)

see here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp[^]

For example x(?|y) means "match x but not when it is followed by y"

So in your case:

Match a 4 to 6 number long string, but not when it is followed by a 0 to 2 digit string a dash and 3 digits:

\d{4,6}(?!\d{0,2}-\d{3})

When I am stuck with Regex a good resource I frequently use to debug my regex expressions is:
http://regexpal.com/[^]

Hope it helps.

Valery.