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http://bugs.exim.org/show_bug.cgi?id=1447
Summary: Support for Enumerations
Product: PCRE
Version: N/A
Platform: All
OS/Version: All
Status: NEW
Severity: wishlist
Priority: medium
Component: Code
AssignedTo: ph10@???
ReportedBy: janmeijer@???
CC: pcre-dev@???
I believe regular expressions lack a construct (ignore the spaces):
(?@ aaa | bbb(d*) | ccc(a*) | ddd)
which, when applied to
"cccaaaddd"
results in this (PHP-alike notation):
array("cccaaa", 2, "aaa")
meaning the (?@ ... ) captures as an integer, and the clauses merely enumerate
options.
this may be an attractive substitute (with identical output):
( aaa (?0)| bbb(d*) (?1)| ccc(a*) (?2)| ddd (?3))
however, the numbers are now optional, which requires a dynamic typing scheme
as in PHP. but it would also allow for:
( aaa (?"one")| bbb (?"two")| ccc (?"three")| ddd (?"four"))
which means that certain patterns can be replaced by a canonical pattern.
anyway, you can see where this is going.
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