RegExp for required keywords?

Question

I've got a system in C# where by a set of keywords are required. Two fields have to be checked if the keywords exist.

Initially I wrote a foreach loop to go through each keyword, then cycle through the results and check. However, this is somewhat inefficient, as on check, I would like to see if any of the keywords exist in a given string, rather than one by one.

Thanks.

Do you have sample code? – YetAnotherUser May 12 '11 at 21:06 — YetAnotherUser, May 12 '11 at 21:06

score 2 · Answer 1 · edited May 23 '17 at 10:34

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Does this question match what you are trying to do?

The answer shows you how to match multiple possible words in one go with a regex

edited May 23 '17 at 10:34

Community

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answered May 12 '11 at 21:14

Russell Troywest

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score 1 · Answer 2 · answered May 12 '11 at 21:13

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If you are on c# 3.5+ try this

        Regex r1 = new Regex("MyKeywordRegex");
        IEnumerable<MyResultClass> results = GetMyResults();
        var myFilteredResults = results.Any(a => (r1.IsMatch(a.Field)));

answered May 12 '11 at 21:13

YetAnotherUser

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You don't need two regexs. One regex can check for the existence of both/all words. – Russell Troywest May 12 '11 at 21:16
Either I'm going mad or you edited your question as I was making that comment :) – Russell Troywest May 12 '11 at 21:18
@Russell - I was updating the code :). Good catch though, thanks. – YetAnotherUser May 12 '11 at 21:21
I'd give you and kniteli an upvote but apparently I'm out of votes today. The one regex is the correct thing to do though. – Russell Troywest May 12 '11 at 21:21

score 1 · Accepted Answer · answered May 12 '11 at 21:17

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((keyword1)|(keyword2)|(keyword3))

Im not sure exactly how c# does regex but this should match and return matches.

You can test regexes here

answered May 12 '11 at 21:17

kniteli

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I believe OP's question is more on loops than regex. – YetAnotherUser May 12 '11 at 21:19

RegExp for required keywords?

3 Answers3