how to use dotall flag for regex.exec()

Question

i want get to string in a multiline string that content any specific character and i want get to between two specific staring.

i used this regex and this work but if

Answer 1

Use catch all character class [\s\S] which means space or non space

var regex = new RegExp("\-{2}Head([\s\S]*)-{2}\/\Head","m");      
var content = "--Head \n any Code \n and String --/Head";
var match = regex.exec(content);