Regex for rejecting specified strings

Question

I have to use asp.net RegularexpressionValidator to validate input from textbox. I want to reject strings that start with "My Links" or "My Urls" I have used this

   ^(?!My Links|My Urls)$

but this rejects everything. How should I write this?

What exactly should be rejected? If you really want to reject My Links|My Urls then do a string compare directly, as it is a const string — Samuel
– Samuel, Commented May 24, 2013 at 9:11
as I said I have to use RegularExpressionvalidator so no other choice. — Spirals Whirls
– Spirals Whirls, Commented May 24, 2013 at 9:12

Tim Pietzcker · Accepted Answer · 2013-05-24 09:30:33Z

2

If your goal is to reject all strings that start with My Links or My Urls, then you can use lookaheads, but only if you remove the $ at the end, or only the empty string will match:

^(?!My Links|My Urls)

works as expected.

edited May 24, 2013 at 9:30

answered May 24, 2013 at 9:11

Tim Pietzcker

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11 Comments

Spirals Whirls Over a year ago

But my guess was that .* will reject strings if it contains My Link|My Url but I need to reject stand alone My Link and MY Url..

Spirals Whirls Over a year ago

My Links sadf rejected this string

Spirals Whirls Over a year ago

Sorry I did not understand the $ what it does here? the last is for the end of line but did not understand the first one

Spirals Whirls Over a year ago

'^(?!My Links$|My Questions$|My Answers$).*$' used this peice but still saving 'My Links ssss'

Tim Pietzcker Over a year ago

How exactly are you using this? Please post the entire code (in your question, not in a comment).

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