String contains another string [duplicate]

Question

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

Regards

Here a benchmark for the most common ways to check if a string is in a string: jsben.ch/#/o6KmH — EscapeNetscape
– EscapeNetscape, Commented Oct 31, 2016 at 17:05

Felix Kling · Accepted Answer · 2011-05-24 10:10:42Z

214

You can use .indexOf():

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

}

answered May 24, 2011 at 10:10

Felix Kling

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7 Comments

donald Over a year ago

didn't work when I use msgCache[id].headers.subject.indexOf("DELIVERY FAILURE:") > -1

donald Over a year ago

and the subject is: DELIVERY FAILURE: User fdfd.ablfdfitt ([email protected]) not listed in Domino Directory

Felix Kling Over a year ago

Well, what is msgCache[id].headers.subject?

Felix Kling Over a year ago

@donald: Works for me: jsfiddle.net/bZUvp (and it also works with node.js, it's the same JavaScript)

donald Over a year ago

Actually, the message is inside an array [ 'DELIVERY FAILURE: User fdfd.ablfdfitt ([email protected]) not listed in Domino Directory' ] sorry for the mistake.

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