Regular Expression in JS

How do you trim all of the text after a comma using JS?

I ha开发者_StackOverflowve: string = Doyletown, PA

I want: string = Doyletown

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var str = 'Doyletown, PA';
var newstr=str.substring(0,str.indexOf(',')) || str;

I added the || str to handle a scenario where the string has no comma

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How about a split:

var string = 'Doyletown, PA';
var parts = string.split(',');
if (parts.length > 0) {
    var result = parts[0];
    alert(result); // alerts Doyletown
}

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using regular expression it will be like:

var str = "Doyletown, PA"
var matches = str.match(/^([^,]+)/);
alert(matches[1]);

jsFiddle

btw: I would also prefer .split() method

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Or more generally (getting all the words in a comma separated list):

//Gets all the words/sentences in a comma separated list and trims these words/sentences to get rid of outer spaces and other whitespace.
var matches = str.match(/[^,\s]+[^,]*[^,\s]+/g);

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Try this:

str = str.replace(/,.*/, '');

Or play with this jsfiddle