this was done before you asked
ast regex(3) has REG_COMMENT which is controlled by the 'x' runtime flag
(as opposed to the suggested 'f') for perl support
to get around the ]] parsing problem (and to get the shell to parse it in the
first place)
simply (...) the entire expression after the flags:
[[ "aaa bbb 123 ccc" == ~(Ex)(
(...) # aaa
[[:blank:]]+
[[:alnum:]]+ # bbb
[[:blank:]]+
([[:digit:]]+) # 123
[[:blank:]]+
) ]] && printf "match!\n"
On Mon, 27 Dec 2010 16:28:12 +0100 =?KOI8-R?B?z8zYx8Egy9LZ1sHOz9fTy8HR?= wrote:
> I'd like to request a "free-spacing and comments" regex mode in ksh so
> that regular expressions, i.e. ~(G), ~(E), ~(X), ~(P), can span
> multiple lines like in perl, JAVA or VB.NET. "Free-spacing and
> comments" in this context means that white spaces are ignored for
> pattern patching and any thing between a "#" character and the end of
> the line is treated as comment, i.e. are "removed" at regex compile
> time, and white spaces and "#" can only be used for matching if
> explicitly addressed with [[:space:]], [[:blank:]] or octal
> addressing.
> Below is an example for the proposed functionality, using modifier "f"
> to enable the free-spacing and comments mode:
> [[ "aaa bbb 123 ccc" == ~(Ef)
> (...)
> [[:blank:]]+
> [[:alnum:]]+
> [[:blank:]]+
> ([[:digit:]]+)
> [[:blank:]]+
> ]] && printf "match!\n"
> This example should print "match!"
> Olga
> --
> , _ _ ,
> { \/`o;====- Olga Kryzhanovska -====;o`\/ }
> .----'-/`-/ [email protected] \-`\-'----.
> `'-..-| / http://twitter.com/fleyta \ |-..-'`
> /\/\ Solaris/BSD//C/C++ programmer /\/\
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