Extract Sub string between two string pattern using Javascript/JQuery

Question

I am new to regular expression. I need to extract between two string pattern ([[tag:: & ]]) and for each occurrence.

For Example:

If the text is :

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus [[tag::4797897]] mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.
[[tag::4797800]] [[tag::4797769]]

As I want the extract text between [[tag:: and ]] , the expected output should be 4797897 , 4797800 and 4797769

I am using Javascript and JQuery

Can some please help me . Thanks in advance

Can you show your code?

C R
– C R

2015-01-21 02:00:26 +00:00
Commented Jan 21, 2015 at 2:00 — C R
– C R, Commented Jan 21, 2015 at 2:00

hwnd · Accepted Answer · 2015-01-21 02:02:43Z

1

To achieve the desired results you can use the exec() method in a loop, pushing the match result of the capturing group to the results array.

var str = ' ... '
var re  = /\[\[tag::([^\]]+)]]/g, 
matches = [];

while (m = re.exec(str)) {
  matches.push(m[1]);
}

console.log(matches) //=> [ '4797897', '4797800', '4797769' ]

answered Jan 21, 2015 at 2:02

hwnd

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1 Comment

hwnd Over a year ago

You're welcome. Next time when a question like this is asked please consider posting what you have attempted to try and solve the problem.

Avinash Raj · Accepted Answer · 2015-01-21 02:08:02Z

Use capturing groups.

\[\[tag::(.*?)]]

Get the value you want from group index 1. .*? will do a non-greedy match of zero or more characters. [ is a regex meta character which denotes the start of a character class. So you need to escape [ in your regex in-order to match a literal [ symbol.

DEMO

> var str = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus [[tag::4797897]] mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.\nLorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus [[tag::4797897]] mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.\n[[tag::4797800]] [[tag::4797769]]"
> var re = /\[\[tag::(.*?)]]/g;
> while (m = re.exec(str)) {
... match.push(m[1]);
... }
> console.log(match)
[ '4797897', '4797800', '4797769' ]

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