Javascript regex error, text between two characters

Question

(?<=\[)[^\]]*(?=\])

which is matching text:

[11/Sep/2016:21:58:55 +0000]

it works fine in sublime while testing, but when I do

str.match(/(?<=\[)[^\]]*(?=\])/)

Ive got error: SyntaxError: Invalid regular expression

what Im doing wrong ?

Use str.match(/\[([^\]]*)\]/) and access the first index if you need one match only. Use /\[([^\]]*)\]/g with RegExp#exec and loop through all the matches to get all the values. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Oct 4, 2016 at 10:05
Well, editor is not using JS to evaluate. Try /\[([^\]]*)(?=\])/ and use captured group #1 — anubhava
– anubhava, Commented Oct 4, 2016 at 10:05
eh so tehre is no way to get text between chars ? :/ Ok I will drop first and last then ;) thanks — FrancMo
– FrancMo, Commented Oct 4, 2016 at 10:07

Shekhar Khairnar · Accepted Answer · 2016-10-05 05:49:09Z

1

You can use regex as :/[^\[\]]+/

const regex = /[^\[\]]+/;
const str = `[11/Sep/2016:21:58:55 +0000]`;
let m;

if ((m = regex.exec(str)) !== null) {
    // The result can be accessed through the `m`-variable.
    m.forEach((match, groupIndex) => {
        console.log(`Found match, group ${groupIndex}: ${match}`);
    });
}

edited Oct 5, 2016 at 5:49

answered Oct 4, 2016 at 10:14

Shekhar Khairnar

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Wiktor Stribiżew · Accepted Answer · 2016-10-04 10:30:00Z

1

You may use capturing and grab the Group 1 contents.

If you have one value to extract, use

var m = "[11/Sep/2016:21:58:55 +0000]".match(/\[([^\]]*)]/);
console.log(m ? m[1] : "No match");

If there are more, use RegExp#exec with /\[([^\]]*)]/g and collect the matches:

var s = "[11/Sep/2016:21:58:55 +0000] [12/Oct/2016:20:58:55 +0001]";
var rx = /\[([^\]]*)]/g;
var res = [];
while ((m=rx.exec(s)) !== null) {
  res.push(m[1]);
}
console.log(res);

answered Oct 4, 2016 at 10:30

Wiktor Stribiżew

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