From: Roman Neuhauser <neuhauser@sigpipe.cz>
To: Kartik Agaram <ak@akkartik.com>
Cc: zsh-users@zsh.org
Subject: Re: parameter expansion with '$'
Date: Wed, 25 Feb 2015 22:18:56 +0100 [thread overview]
Message-ID: <20150225211856.GD4524@isis.sigpipe.cz> (raw)
In-Reply-To: <CANOtCLVAzdZacxtJps4YEyGGzq5AWfSxXzhQ+TiS-oTOnOMPTw@mail.gmail.com>
# ak@akkartik.com / 2015-02-25 12:50:16 -0800:
> I'd like to only perform the substitution when 'c' occurs at the
> end of the string:
>
> $ echo ${X/c$/}
> abc # I'd like this to return 'ab' like above
>
> I assume others see the same results? Can anybody help me understand why it
> doesn't work, and how I can interpret the '$' as a regular expression
> wildcard rather than some other sort of zsh sigil?
these patterns are *not* regular expressions. zshexpn(1) says near
the start of PARAMETER EXPANSION:
In the expansions discussed below that require a pattern, the form
of the pattern is the same as that used for filename generation; see
the section `Filename Generation'.
${name/pattern/repl}
${name//pattern/repl}
[...]
The pattern may begin with a `#', in which case the pattern must
match at the start of the string, or `%', in which case it must
match at the end of the string, or `#%' in which case the pat-
tern must match the entire string. [...] Note also that the `#',
`%' and `#%' are not active if they occur inside a substituted
parameter, even at the start.
--
roman
next prev parent reply other threads:[~2015-02-25 21:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-25 20:50 Kartik Agaram
2015-02-25 21:18 ` Roman Neuhauser [this message]
2015-02-25 21:20 ` Kartik Agaram
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