How can I replace a regex substring match in Javascript?
var str = 'asd-0.testing';var regex = /(asd-)\d(\.\w+)/;str = str.replace(regex, "$11$2");console.log(str);Or if you're sure there won't be any other digits in the string:
var str = 'asd-0.testing';var regex = /\d/;str = str.replace(regex, "1");console.log(str);
using str.replace(regex, $1);:
var str = 'asd-0.testing';var regex = /(asd-)\d(\.\w+)/;if (str.match(regex)) { str = str.replace(regex, "$1" + "1" + "$2");}Edit: adaptation regarding the comment
I would get the part before and after what you want to replace and put them either side.
Like:
var str = 'asd-0.testing';var regex = /(asd-)\d(\.\w+)/;var matches = str.match(regex);var result = matches[1] + "1" + matches[2];// With ES6:var result = `${matches[1]}1${matches[2]}`;