Regular Expression in JS

Question

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

I have: string = Doyletown, PA

I want: string = Doyletown

Trey · Accepted Answer · 2011-05-31 22:25:35Z

6

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

edited May 31, 2011 at 22:25

answered May 31, 2011 at 22:10

Trey

5,5404 gold badges25 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

arcain Over a year ago

@teneff +1, removed my version.

Darin Dimitrov · Accepted Answer · 2011-05-31 22:09:50Z

4

How about a split:

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

answered May 31, 2011 at 22:09

Darin Dimitrov

1.0m276 gold badges3.3k silver badges3k bronze badges

1 Comment

Jonathon Over a year ago

What? the length will always be greater then or equal to 1! This is not a very well done example nor would I suggest using a method that makes an entire array and will internally have to iterate through the entire string even if it finds a "," right away.

Teneff · Accepted Answer · 2011-05-31 22:13:03Z

1

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

answered May 31, 2011 at 22:13

Teneff

32.3k13 gold badges76 silver badges107 bronze badges

1 Comment

Jonathon Over a year ago

That should be matches[0]. [1] does not even exist because you did not use a g match.

Jonathon · Accepted Answer · 2011-05-31 23:05:37Z

0

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);

answered May 31, 2011 at 23:05

Jonathon

2,6755 gold badges30 silver badges50 bronze badges

Comments

Dave Dopson · Accepted Answer · 2012-04-14 02:20:48Z

0

Try this:

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

Or play with this jsfiddle

answered Apr 14, 2012 at 2:20

Dave Dopson

42.9k21 gold badges97 silver badges85 bronze badges

Collectives™ on Stack Overflow

Regular Expression in JS

5 Answers 5

1 Comment

1 Comment

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

1 Comment

1 Comment

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related