CODEWITHSUNDEEP
javascriptnode.jsregex
Hugo Delannoy
Hugo Delannoy

Reputation: 73

Javascript regexp replace capturing

I'm trying to use regex in a Nodejs app. I usually use it in Python and it seems to have some differences.

Here is the problem : I have this string \newcommand{\hello}{@replace} and I want to replace @replace by REPLACED in the second curly bracelets ONLY when I found \hello in the first curly bracelets. So the expected result is : \newcommand{\hello}{REPLACED}

I try this:

r = new RegExp('\\newcommand{\\hello}{(.*?)}');
s = '\\newcommand{\\hello}{@replace}';
s.replace(r, 'REPLACED');

But nothing is replaced... any clue?

Upvotes: 1

Views: 60

Answers (3)

Georgy
Georgy

Reputation: 2462

r = new RegExp(/\\newcommand{\\hello}{@replace}/);
s = '\\newcommand{\\hello}{@replace}';
let a = s.replace(r, '\\newcommand{\\hello}{REPLACED}');

console.log(a)

Output would be : "\newcommand{\hello}{REPLACED}"

Upvotes: 1

ykit9
ykit9

Reputation: 493

You don't need regex at all to perform this kind of operation. You can simply use string at first parameter:

s = '\\newcommand{\\hello}{@replace}';
s.replace('@replace', 'REPLACED'); // => "\newcommand{\hello}{REPLACED}"

Upvotes: 0

Zawiszor
Zawiszor

Reputation: 538

I'm not sure if I understood the question correctly. Is this what you're looking for?

function replaceWith(myReplacement) {
    var original = "\\newcommand{\\hello}{@replace}";
    var regex = "{\\hello}{@replace}";

    return original.replace(regex, `{\\hello}{${myReplacement}}`)
};


console.log(replaceWith("World"));

Upvotes: 0

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