Question

I’m trying to finish up my assignment and only last one is to validate the URL

The requirement is as follow:

url only allows alphanumerical characters and the following :/.~?=+& No two periods can exist consecutively.

here is what I have so far but it doesn’t work

m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\?([^#]*))?(?:#(.*))?|

So what happen now that anything I enter it just pass the matching process that I do which is something like this

$return = $search =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\?([^#]*))?(?:#(.*))?|;

so it always return true for me even I just type nothing in the search box.

Answer 1

Here is what I’m getting from my regex turbulator (soon to be a commercial product)

Without group count

 (?:                                                 #(.*))?
      ( [^:/?\#]+ )
      :
 )?
 (?:
      //
      ( [^/?\#]* )
 )?
 ( [^?\#]* )
 (?:
      \?
      ( [^\#]* )
 )?
      (  <-- Unbalanced  '('
      ?:

With group count

     (?:                                                 #(.*))?
1         ( [^:/?\#]+ )
          :
     )?
     (?:
          //
2         ( [^/?\#]* )
     )?
3    ( [^?\#]* )
     (?:
          \?
4         ( [^\#]* )
     )?
          (  <-- Unbalanced  '('
          ?: