digitalmars.D.bugs - [Issue 9390] New: Option for verbose regular expressions
- d-bugmail puremagic.com (23/40) Jan 24 2013 http://d.puremagic.com/issues/show_bug.cgi?id=9390
- d-bugmail puremagic.com (32/32) Jan 25 2013 http://d.puremagic.com/issues/show_bug.cgi?id=9390
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 puremagic.com ReportedBy: bearophile_hugs eml.cc I'd really like an option to write "verbose" regular expressions in D, like in Python: http://docs.python.org/2/library/re.htmlre.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 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: 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". -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Jan 24 2013
http://d.puremagic.com/issues/show_bug.cgi?id=9390 Dmitry Olshansky <dmitry.olsh gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dmitry.olsh gmail.com 12:13:45 PST --- How about adding the common extensions that is called comments inside regular expression. I can't recall synatx off-hand but it's something like: Plus you can already use any of the follwoing: auto pattern - r"the first piece" // comment r"the second piece" //comment 2 ... r" the last piece"; //last comment Or if implicit concatenation feels too dirty: auto pattern - r"the first piece" // comment ~ r"the second piece" //comment 2 ... ~ r" the last piece"; //last comment Either way free-form regex + top-level explanatory note is enough by my standards. The rationale is if you have to explan every piece in isolation then it's one of 2 cases: you are explaning machanics to people that don't know what regex is (and it's wrong) or the regex pattern is too darn complex for its own good. Since this is enhancement request I hereby propose 2 ways to solve it: close as won't fix or add the aformentioned extension for comments (that at least is more or less common). I'm not going to add another option that messes with syntax rules. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Jan 25 2013