C#, regex to find a but not find b

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I am foreaching a payment details in the bank, I want the regex to find value for example 12345 but not find anything when its 12345-123 or 123456-12345.
When I use \d{4,6}(?!\d{0,2}-\d{3}) expression
It finds 12345 but it also finds 12345 from the expression(123456-12345)
Any ideas?

Posted 18-Jul-13 21:59pm

Soloveikok

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Kenneth Haugland · Answer 1 · 2013-07-18T22:15:00

Solution 1

Why not something like:

(?: )(\d*)((?: )|$)

And you could use Expresso to modify the expression to your needs

Posted 18-Jul-13 22:15pm

Kenneth Haugland

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Soloveikok 19-Jul-13 8:09am

could you be more specific? I`m sorry for my lazyness