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This question already has an answer here:

How can I check if a string contains another string instead of using "==" to compare the whole string?

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marked as duplicate by Bergi, Andrew Whitaker, isedev, Luca Geretti, chepner Mar 23 at 17:34

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1 Answer

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You can use .indexOf():

if(str.indexOf(substr) > -1) {

}
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didn't work when I use msgCache[id].headers.subject.indexOf("DELIVERY FAILURE:") > -1 – donald May 24 '11 at 10:12
and the subject is: DELIVERY FAILURE: User fdfd.ablfdfitt ([email protected]) not listed in Domino Directory – donald May 24 '11 at 10:13
Well, what is msgCache[id].headers.subject? – Felix Kling May 24 '11 at 10:13
it returns "DELIVERY FAILURE: User fdfd.ablfdfitt ([email protected]) not listed in Domino Directory" – donald May 24 '11 at 10:14
@donald: Works for me: jsfiddle.net/bZUvp (and it also works with node.js, it's the same JavaScript) – Felix Kling May 24 '11 at 10:14
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