Regex - Match any sequence of characters except a particular word in a URL

Question

I want to match a URL that contains any sequence of valid URL characters but not a particular word. The URL in question http://gateway.ovid.com and I want to match anything but the word 'gateway' so:

• http://abc123.ovid.com - would match
• http://abc.123.ovid.com - would match
• http://abc-123.ovid.com - would match
• http://fdfsffdfs.ovid.com - would match

but

• http://gateway.ovid.com - would NOT match

Something like the following:

^http://([a-z0-9\-\.]+|(?<!gateway))\.ovid\.com$

but it doesn't seem to work.

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Update: Sorry forget to mention the language, it's C#.NET

Answer 1

You didn't specify host language, but why not something like this psuedocode

bool good = Regex.Match( yourRegex ) and not Regex.Match(gateway)

Answer 2

Your regex is almost correct except the extra '|' after '+'. Remove the '|'

^http://([a-z0-9\-\.]+(?<!gateway))\.ovid\.com$