cc: [email protected]
Subject: Re: Re: [ast-users] [ksh93] [[ == ]] does not update ${.sh.match}?
--------
> But the behavior is not consistent with the =~ operator:
>
> $ echo ${.sh.version}
> Version jM 93u 2011-02-08
> $ [[ foo =~ foo ]]
> $ ts -p .sh.match
> typeset -a .sh.match=(foo)
> $ [[ bar =~ 'bar' ]] <== The right hand operand is quoted so it's a
> string match
> $ ts -p .sh.match
> typeset -a .sh.match=(bar) <== but .sh.match is updated here.
> $
>
The == operator is defined as a string match when there are no pattern
characters.
For =~ that is not the case. For example,
[[ bbar =~ b+ ]]
is not a string match even though it does not contain shell pattern
characters. It is up the the regex library to know which characters
are special with ERE's.
David Korn
[email protected]
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