Is it Possible to Concatenate variable in Split Regexp in Javascript? Eg: var.split(/[A-Z]/+ variable + / \d/); [duplicate]

This question already has answers here: How do you use a variable in a regular expression? (27 answers) Closed 9 years ago.

Regexp Javascript , is it possible to concatenate ?

Ex 1: (Working Example)

var reg = new RegExp(/(\d+): ([A-Za-z0-9çÇáéíóúãõÁÉÍÓÚÃÕ]+): ([A-Za-z0-9çÇáéíóúãõÁÉÍÓÚÃÕ]+)/);
var arr = all_titles.split(reg);

I'm trying to do it but I can't figure it out how to concatenate, cause I actually want to concatenate a variable in it, but if I add the Quotes it just doesn't work.

Ex 2:

var reg = new RegExp("/(\d+): ([A-Za-z0-9çÇáéíóúãõÁÉÍÓÚÃÕ]+): ([A-Za-z0-9çÇáéíóúãõÁÉÍÓÚÃÕ]+)/");
var arr = all_titles.split(reg);

The Example 2 doesn't work for some reason (without even any concatenation of variable), then I stripped the delimiters and still didn't work.

What I want to do is get something like this -> 20: lalalalala: whateverIsWritten

var variable = "lalalalala";
var开发者_如何学Go reg = new RegExp("/(\d+): "+variable+": ([A-Za-z0-9çÇáéíóúãõÁÉÍÓÚÃÕ]+)/");
var arr = all_titles.split(reg);

Thanks in advance!

---

Try this:

new RegExp("(\\d+): "+variable+": ([A-Za-z0-9çÇáéíóúãõÁÉÍÓÚÃÕ]+)");

\ escaped, / removed from start and end.

---

You can compile a regular expression from a variable, e.g.:

var regex = new RegExp();

var src = "\\s"; // don't forget to escape slashes!
var mods  = "g";
regex.compile(src, mods); 

alert(regex.source);