TR1::regex_match - not matching using whole words

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I'm using the TR1::Regex and want to not match when certain words are in the string. Additional text can be before and after each key word.

Ex: Match with "Elephant" except if "Rhino" is in the test string.
Source="Elephant Rhino" - No match
Source="Elephant Crocodile" - Match

Source="The Grey Elephant saw the Rhino run" - No Match
Source="The Grey Elephant saw the Crocodile swim" = Match

Is this within the capabilities?

Thanks

Posted 7-Apr-11 10:01am

cvogt61457

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ctwi001 · Answer 1 · 2011-04-07T11:49:00

Solution 1

You'll want to check for a substring existing or not; e.g.

std::string str = "Elephant Rhino Crocodile";
std::tr1::regex rxRhino("Rhino");

Then

regex_search(str.begin(), str.end(), rx)

will return true because the regular expression matches a substring of str.

Posted 7-Apr-11 11:49am

ctwi001

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ctwi001 7-Apr-11 21:44pm

Sorry, thanks Nishant for noticing I hadn't answered the full question, you'll need to do 2 calls:
1 - check if the undesired string is contained
2 - check if the desired string is contained

If (1) is FALSE and (2) is TRUE, then your overall check passes.

Nish Nishant · Answer 2 · 2011-04-07T13:11:00

Solution 2

[Adding to what ctwi001 posted.]

It would be simpler to do this in two calls, in the first one check for your "Except" words. If that search is false, then in the 2nd call check for your "Contains" words. If that check's true you know you can proceed.

Posted 7-Apr-11 13:11pm

Nish Nishant