if sentence contains string [duplicate]

Question

If a sentence contains "Hello World" (no quotes) then I need to return true and do something. Possible sentences could be like this:

var sentence = "This is my Hello World and I like widgets." var sentence = "Hello World - the beginning of all" var sentence = "Welcome to Hello World" if ( sentence.contains('Hello World') ){ alert('Yes'); } else { alert('No'); }

I know the .contains does not work, so I'm looking for something does work. Regex is the enemy here.

JaredPar · Accepted Answer · 2010-11-22 18:05:57Z

38

The method you're looking for is indexOf (Documentation). Try the following

if (sentence.indexOf('Hello World') >= 0) { alert('Yes'); } else { alert('No'); }

answered Nov 22, 2010 at 18:05

JaredPar

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6 Comments

Stephen Over a year ago

Don't just try it. Do it. ;)

JaredPar Over a year ago

@Stephen, is there an extra semantic that !== false adds here or is it just for readability?

Stephen Over a year ago

Eh, sorry. I just deleted that part of the comment, Jared. In fact, if the string doesn't exist, indexOf returns -1 not false.

JaredPar Over a year ago

@Stephen, ok that was my understanding and I was wondering how !== false would work in that situation (still fairly new to javascript).

JaredPar Over a year ago

@Stephen, no worries. It actually prompted me to do further reading on strict vs. non-strict equality in javascript and I learned quite a bit. So overall a win :)

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Timothy S. Van Haren · Accepted Answer · 2010-11-22 18:07:41Z

Try this instead:

if (sentence.indexOf("Hello World") != -1) { alert("Yes"); } else { alert("No"); }

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