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Editorial Team
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Asked: 2026-06-15T21:55:39+00:00

So a substring can take two parameters, the index to start at and the

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So a substring can take two parameters, the index to start at and the index to stop at like so

   var str="Hello beautiful world!";
   document.write(str.substring(3,7));

but is there a way to designate the start and stopping points as a set of characters to grab, so instead of the starting point being 3 I would want it to be “lo” and instead of the end point being 7 I would want it to be “wo” so I would be grabbing “lo beautiful wo”. Is there a Javascript function that serves that purpose already?

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1 Answer

  1. Editorial Team

    Sounds like you want to use regular expressions and string.match() instead:

    var str="Hello beautiful world!";
document.write(str.match(/lo.*wo/)[0]); // document.write("lo beautiful wo");

    Note, match() returns an array of matches, which might be null if there is no match. So you should include a null check.

    If you’re not familiar with regexes, this is a pretty good source:
    http://www.w3schools.com/jsref/jsref_obj_regexp.asp

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