REGEX Remove Space

Question

I want to creating regex to remove some matching string, the string is phone number

Example user input phone number like this:

+jfalkjfkl saj f62 81 78

Answer 1

It would appear that you need two operations:

1. Remove everything that is neither a blank nor a digit:

   s/[^ \d]//g;
   

2. Remove all extra blanks:

   s/  +/ /g;
   

   If you need to remove leading and trailing blanks too:

   s/^ //;
   s/ $//;
   

   (after the replace multiple blanks with a single blank).

You can use \s to represent more space-like characters than just a blank.