regx expression? (link included)

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A favor please .  Would someone tell me if this regx requires
something I don't have installed?  I copied it, but it will not
compile.  I've never seen a regx written like this and I kind of
wonder if this is input to some other parser.  Thanks.   (perk 5,8,8)

Here's the link. (I pasted a copy below also, but I'm never sure if
it's readable or not)

my $email_address = qr {
      (?<addr_spec>       (?&local_part) \@ (?&domain))
      (?<local_part>      (?&dot_atom) | (?&quoted_string))
      (?<domain>          (?&dot_atom) | (?&domain_literal))
      (?<domain_literal>  (?&CFWS)? \[ (?: (?&FWS)? (?&dcontent))* (?
                                    \] (?&CFWS)?)
      (?<dcontent>        (?&dtext) | (?&quoted_pair))
      (?<dtext>           (?&NO_WS_CTL) | [\x21-\x5a\x5e-\x7e])

      (?<atext>           (?&ALPHA) | (?&DIGIT) | [!#$%&'*+-/=?
      (?<atom>            (?&CFWS)? (?&atext)+ (?&CFWS)?)
      (?<dot_atom>        (?&CFWS)? (?&dot_atom_text) (?&CFWS)?)
      (?<dot_atom_text>   (?&atext)+ (?: \. (?&atext)+)*)

      (?<text>            [\x01-\x09\x0b\x0c\x0e-\x7f])
      (?<quoted_pair>     \ (?&text))

      (?<qtext>           (?&NO_WS_CTL) | [\x21\x23-\x5b\x5d-\x7e])
      (?<qcontent>        (?&qtext) | (?&quoted_pair))
      (?<quoted_string>   (?&CFWS)? (?&DQUOTE) (?:(?&FWS)? (?
                           (?&FWS)? (?&DQUOTE) (?&CFWS)?)

      (?<word>            (?&atom) | (?&quoted_string))
      (?<phrase>          (?&word)+)

      # Folding white space
      (?<FWS>             (?: (?&WSP)* (?&CRLF))? (?&WSP)+)
      (?<ctext>           (?&NO_WS_CTL) | [\x21-\x27\x2a-\x5b\x5d-
      (?<ccontent>        (?&ctext) | (?&quoted_pair) | (?&comment))
      (?<comment>         \( (?: (?&FWS)? (?&ccontent))* (?&FWS)? \) )
      (?<CFWS>            (?: (?&FWS)? (?&comment))*
                          (?: (?:(?&FWS)? (?&comment)) | (?&FWS)))

      # No whitespace control
      (?<NO_WS_CTL>       [\x01-\x08\x0b\x0c\x0e-\x1f\x7f])

      (?<ALPHA>           [A-Za-z])
      (?<DIGIT>           [0-9])
      (?<CRLF>            \x0d \x0a)
      (?<DQUOTE>          ")
      (?<WSP>             [\x20\x09])


Re: regx expression? (link included)

Quoted text here. Click to load it
Quoted text here. Click to load it

Kind-of: this regex is pretty much a demonstration of the new features
in the 5.10 regex engine. So, you would need perl 5.10.0 or later to use


Re: regx expression? (link included)

Ben Morrow wrote:
Quoted text here. Click to load it

Of course, Regexp::Common will work fine on the OP's platform:

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