Regex pattern UNMATCH in VB.NET or C#

need a pattern to match a string which should NOT be --

777777777
888888888
999999999

or start with 00 or 02 or 04.

when i tried to go开发者_Python百科 create a pattern to match the above requirements, i got it done by -

Dim _pattern6 As String = "^(7+|8+|9+|(00|07|08|09|17|18|19|28|29|43|48|69|70|78|79|80|96|97).*)$"

could not get the NOT MATCH part done.

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What you want is negative lookahead.

@"^(?!([789])\1{8}$|0[024]).*$"

The negative lookahead (?!...) means "whatever follows this position cannot match any of these patterns." So (?!7{9}).* means "any string of characters (.*) that doesn't start with nine 7s in a row." The ([789])\1{8}$ is shorthand for 9 repeated digits. It means "Either 7, 8, or 9 followed by itself another 8 times."

Tested on RegexPlanet: http://fiddle.re/tz8p

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You could try to match to unwanted parts. If that returns true, you know the attempt to "not match" would have been false, and vice versa.

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Here you go

[^(7{9}|8{9}|9{9}|00|02|04)]+