Get string between 2 words, that contain this words inside him too

Question

I have strings, and i want to find in them 2 words: \'start\' and \'end\'.

\'start\' and \'end\'

Answer 1

I'm having a hard time understanding what you exactly want, but if I understand correctly: you cannot do this with pure regex in javascript because lookbehind (positive (?<=...) and negative (?) is not supported, and thus you would not be able to match the 'start(n)' before the match result.

---

but instead you can use subgroups (subgroups aren't fully supported in javascript so you'll need to use replace):

var string = "something start(1) something_needed end(1) something";
var regex = /start\((\d+)\)(.*)end\(\1\)/;
string.replace(regex, function($0, $1, $2) {

    var result = $2;
    console.log($2)
    //do stuff with $2 here
});

$0 is the original match (start\((\d+)\)(.*)end\(\1\))

$1 and $2 are the groups that are outputted by the regex.

$1 refers to (\d+). It's already used to 'store' the number behind start (1 in this case). But here's where the magic happens: it gets loaded again and matched against with \1 inside the regex.

$2 is where the info you need is stored. it refers to (.*)