How to get variables from a string using regex in Javascript?

Question

I have a javascript string variable like so:

var somestring = "mypattern_var1_var2";

How can I use regex to extract var1 & var2?

score 3 · Accepted Answer · answered Mar 29 '11 at 19:28

3

I would just use the split() method instead if it's that straightforward:

var somestring = "mypattern_var1_var2";
var tokens = somestring.split("_");
var var1 = tokens[1];
var var2 = tokens[2];

answered Mar 29 '11 at 19:28

McStretch

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score 2 · Answer 2 · edited May 23 '17 at 12:11

2

No need

var parts = somestring.split("_");
alert(parts[1] + ':' + parts[2])

Or get real fancy like How can I match multiple occurrences with a regex in JavaScript similar to PHP's preg_match_all()?

And we MUST have jQuery in the equation: Regular expression field validation in jQuery

edited May 23 '17 at 12:11

Community

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answered Mar 29 '11 at 19:28

mplungjan

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Haha barely! You deserve an upvote too. It gets crazy when each answer is within seconds of each other. – McStretch Mar 29 '11 at 19:32
@McStr - so now we should add a fiddle to demo this complex script. I wonder if we can't make it more interesting with a jQuery plugin and `each` ;) – mplungjan Mar 29 '11 at 19:35
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Hahaha it's not a true javascript question if jQuery isn't mentioned. I do love me some jQuery though! – McStretch Mar 29 '11 at 19:39

score 2 · Answer 3 · answered Mar 29 '11 at 19:28

I know you specified regex, but is there a specific reason to use it?

An alternative would be to use the .split() method, which would probably be easier.

var somestring = "mypattern_var1_var2";
var results = somestring.split("_");

var var1 = results[1];
var var2 = results[2];

score 1 · Answer 4 · answered Mar 29 '11 at 19:28

You could use a split() in this situation - given that you always know that you will have a pattern in the beginning, (given that the pattern doesn't contain any '_'s)

var somestring = "mypattern_var1_var2";
var example = somestring.split('_');

var1 = example[1];
var2 = example[2];

Demo

How to get variables from a string using regex in Javascript?

4 Answers4