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Regexp help

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Josh:
Alright, I am trying to create a regexp that performs the following:

Selects an IP address from a line but only if the line starts with a pre-defined text string. There will be text in between the text string and the IP address -- I want to ignore the entire line except for the IP address. I know this is do-able but it is driving me nuts.

Any ideas?

Renegade:
^definedstring.+([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}).+$

Or perhaps:

^definedstring.+([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+).+$

But, that should do it or at least give you enough to test & tweak. You'll have 1 capture group with the IP address.

Renegade:
This is better:

^definedstring.+([1-9][0-9]{0,2}\.[1-9][0-9]{0,2}\.[1-9][0-9]{0,2}\.[1-9][0-9]{0,2}).+$

Josh:
So...Here is a single line of what I am trying to filter:

SOME DATE TIME GROUP HERE :: CtrlChan Some more text here [192.192.192.192]

I want to filter out the IP address in any line that contains CtrlChan.

Josh:
Sample line

2014-10-10 19:28:01.110::ErrorMsg::CtrlChan Error_Decode [192.192.192.192]

If, and only if, the line has CtrlChan in it do I want to extract the IP address from the line. This will be a very large file (200+MB per file) with a large number of different entries.

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