March 15, 2014 [Issue 12367] New: std.regex: Recognize (?# ... ) comment syntax | ||||
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https://d.puremagic.com/issues/show_bug.cgi?id=12367 Summary: std.regex: Recognize (?# ... ) comment syntax Product: D Version: D2 Platform: All OS/Version: All Status: NEW Severity: enhancement Priority: P2 Component: Phobos AssignedTo: nobody@puremagic.com ReportedBy: thecybershadow@gmail.com --- Comment #0 from Vladimir Panteleev <thecybershadow@gmail.com> 2014-03-15 02:11:29 EET --- A comment syntax would be handy for particularly long expressions. This syntax seems to be already supported by several existing engines: http://www.regular-expressions.info/freespacing.html#parenscomment -- Configure issuemail: https://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
March 15, 2014 [Issue 12367] std.regex: Recognize (?# ... ) comment syntax | ||||
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Posted in reply to Vladimir Panteleev | https://d.puremagic.com/issues/show_bug.cgi?id=12367 bearophile_hugs@eml.cc changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |bearophile_hugs@eml.cc --- Comment #1 from bearophile_hugs@eml.cc 2014-03-14 17:21:08 PDT --- (In reply to comment #0) > A comment syntax would be handy for particularly long expressions. > > This syntax seems to be already supported by several existing engines: http://www.regular-expressions.info/freespacing.html#parenscomment While it's good to have a basic (?# ... ) comment syntax, I much prefer the Python verbose regex syntax, because it allows me to lay down regexes as little programs, with logically indented lines and #-style comments: http://docs.python.org/2/library/re.html http://www.diveintopython.net/regular_expressions/verbose.html >>> pattern = """ ^ # beginning of string M{0,4} # thousands - 0 to 4 M's (CM|CD|D?C{0,3}) # hundreds - 900 (CM), 400 (CD), 0-300 (0 to 3 C's), # or 500-800 (D, followed by 0 to 3 C's) (XC|XL|L?X{0,3}) # tens - 90 (XC), 40 (XL), 0-30 (0 to 3 X's), # or 50-80 (L, followed by 0 to 3 X's) (IX|IV|V?I{0,3}) # ones - 9 (IX), 4 (IV), 0-3 (0 to 3 I's), # or 5-8 (V, followed by 0 to 3 I's) $ # end of string """ -- Configure issuemail: https://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- |
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