Re: [Boost-users] regexp - how to do an anti-match on a word

From: John Maddock (john_at_[hidden])
Date: 2008-02-22 04:15:55

David Ward wrote:
> Boosters:
> 
> 
> 
> I'm having trouble determining a regular expression that will do the
> following:
> 
> 
> 
> 1.      Match the following strings:
> TermGeMstreamIPTriplePlay_11.0.IpTxMstream_0.DefaultGateway
> TermGeMstreamIPTriplePlay_11.0.VplsTxMstream_0.CurMbps
> TermGeMstreamIPTriplePlay_11.0.MplsTxMstream_0.AvgMbps
> TermGeMstreamIPTriplePlay_11.0.MacTxMstream_0.Address
> 
> 
> 
> 2.      But not match the string:
> TermGeMstreamIPTriplePlay_11.0.TrafficTxMstream_0.RampStart
> 
> 
> 
> So, essentially match the strings with IpTx, VplsTx, MplsTx and MacTx,
> but not match strings with TrafficTx.
> 
> 
> 
> Right now, I have:
> 
> 
> 
> .*\.(IpTx|MacTx|MplsTx|VplsTx)Mstream_0\..*
> 
> 
> 
> This works, however, it is not very robust because there may be more
> entries added to the matching words over time.
> 
> 
> 
> Is there someway to do an anti-match on the word "TrafficTx"?
> Something 
> like:
> 
> 
> 
> .*\.(!TrafficTx)Mstream_0\..*

Use a zero width lookahead assertion, so something like:

.*\.(?!TrafficTx)\w+Mstream_0\..*

HTH, John.