Regular Expressions via easy concatenation

compileRegExp.js

/**
 * For convenience's sake (and to avoid all those '\\\' strings), this can be used to create new regular expression objects 
 * from any strings or existing RegExp objects input via simple concatenation.
 * @param {string[]|RegExp[]} args - any number of strings or regular expressions
 * @param {string} [flags] - optional flags
 * @returns {RegExp}
 */
function compileRegExp( args, flags = '' ) {
  const src = args.map( arg => {
    if ( arg instanceof RegExp ) return arg.source;
    if ( typeof arg === 'string' ) return arg;
    throw new TypeError( 'Provided arguments must be of type String or RegExp' );
  } ).join( '' );
  return new RegExp( src, flags );
}