Regex for rejecting specified strings

Answer 06/28/2019 Developer FAQ 5

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?

Answer1:

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.

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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?

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.

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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?

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.