Combining regular expressions in Javascript

Question

Is it possible to combine regular expressions in javascript.

For ex:

 var lower = /[a-z]/;
 var upper = /[A-Z]/;
 var alpha = upper|lower;//Is this          


        

Answer 1

use a general function:

const getComposedRegex = (...regexes) => new RegExp(regexes.map(regex => regex.source).join("|"))

Then call it with any number of Regexes.

const reg1 = /[w]{3}/i
const reg2 = /http/i

const composedReg = getComposedRegex(reg1, reg2)