[Issue 9390] New: Option for verbose regular expressions

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9390

           Summary: Option for verbose regular expressions
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2013-01-24 18:14:01 PST ---
I'd really like an option to write "verbose" regular expressions in D, like in
Python:

http://docs.python.org/2/library/re.html


> re.X
> re.VERBOSE
> 
>     This flag allows you to write regular expressions that look
>     nicer. Whitespace within the pattern is ignored, except when in a
>     character class or preceded by an unescaped backslash, and, when
>     a line contains a '#' neither in a character class or preceded by
>     an unescaped backslash, all characters from the leftmost such '#'
>     through the end of the line are ignored.
> 
>     That means that the two following regular expression objects that
>     match a decimal number are functionally equal:
> 
>     a = re.compile(r"""\d +  # the integral part
>                        \.    # the decimal point
>                        \d *  # some fractional digits""", re.X)
>     b = re.compile(r"\d+\.\d*")


RE code is code like every other, so it enjoys comments, a nicer indenting and
formatting.

Making RE more readable helps their debug and understand. In my Python code all
RE longer than half a line of chars are "verbose".

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