javascript正则表达式替换变量

Question

How can i replace character with regex, but from variable. Example:

var separator = '-';
text = text.replace(/[-\s]+/g, separator);

this will replace - trailing character with separator, which i the same in this case.

So, i need to set this - character from variable separator :

var separator = '-';
var regex = '/['+separator+'\s]+/g';
text = text.replace(regex, separator);

How can i do this? Thanks.

Answer 1

Use RegExp to dynamically generate regular expression:

function escapeRegExp(string){
    return string.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1");
}
var regex = new RegExp('[' + escapeRegExp(separator) + '\\s]', 'g');

escapeRegExp comes from Regular Expressions - JavaScript | MDN .

NOTE : You have to escape \\ , and separator .