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Re: Quoting near =~ is inconsistent

From: Chet Ramey
Subject: Re: Quoting near =~ is inconsistent
Date: Tue, 23 Jan 2007 17:38:45 -0500
User-agent: Thunderbird (Macintosh/20061207)

Tim Waugh wrote:
> Further to this, I am having trouble porting existing scripts to
> bash-3.2's new style of regex matching.
> Here is one example that is problematic: I want to use a character class
> in my regex, but bash seems to get confused by the ':]]' closing the
> class, and apparently takes it as a ']]' closing the conditional
> expression.
> Here is a distilled test case:
> [[ $line =~ [[:space:]]*(a)?b ]] && echo match || echo no match
> I used single quotes around the RHS in bash-3.1, which worked very well.
> How should this be written so as to work with bash-3.2 -- and, of
> course, still with bash-3.1?

It cannot; the level of backwards compatibility is not that great.  I will
have to think about a solution.


``The lyf so short, the craft so long to lerne.'' - Chaucer
                       Live Strong.  No day but today.
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/

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