js regex with variable

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showing results for - "js regex with variable"
Frieda
03 Nov 2017
1// CREATE A REGEXP object
2var replace = "regex";
3var re = new RegExp(replace,"g");
4//then use
5"mystring".replace(re, "newstring")
source
Joshua
02 Feb 2018
1var pattern="cd"
2var repeats=3
3new RegExp(`${pattern}{${repeats}}`, "g") 
4
source
David
02 Jul 2020
1function alphabet(str) {
2  let alphabetStr = 'abcdefghijklmnopqrstuvwxyz';
3  let strRegEx =`[${str[0]}-${str[3]}]`;  //set regex with variables
4  let newRegEx = new RegExp(strRegEx, 'g'); //create new regex object
5  //regex object pattern is: RegExp(pattern, modifiers)
6  let charSetStr = alphabetStr.match(newRegEx);  
7  return charSetStr;
8}
9
10console.log(alphabet('abce'));
11//expected [ 'a', 'b', 'c', 'd', 'e' ]
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