Escapes special characters in a string so it can be used with RegExp
###usage
install:
npm install --save reg-escape
reg-escape inserts escape characters before every RegExp special character in a given string so it can be used to test against in a regular expression.
var regEscape= require( 'reg-escape' );
var passwordCharacters= "~!@#$%^&*()_+|}{][\":?><`1234567890-=qwertyuiopasdfghjkl;'zxcvbnm,./";
// define passwords that can only exist of passwordCharacters,
// minimal 8, maximum 20 chars
var passwordLegit= new RegExp( '^['+ regEscape(passwordCharacters)+ ']{8,20}$' );
console.log( passwordLegit );
// /^[~!@#\$%\^\&\*\(\)_\+\|}{\]\[":\?\>\<`1234567890\-=qwertyuiopasdfghjkl;'zxcvbnm,\.\/]{8,20}$/
// the white space is not allowed, this will fail
var password= 'my./$^pass[ ]word';
console.log( passwordLegit.test(password) );
// false
console.log( passwordLegit.test('my./$^pass[]word'))
// true<array> regEscape.SPECIAL_CHARS are the special characters used, you could modify this if needed.
###licence
MIT