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Negative length parameter expansion

X-seq: zsh-users 20139
From: Thorsten Kampe <thorsten@xxxxxxxxxxxxxxxx>
To: zsh-users@xxxxxxx
Subject: Negative length parameter expansion
Date: Sun, 12 Apr 2015 09:27:39 +0200
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Hi,

Bash got negative length parameter expansion (like in `${STRING:11:-
17}`) in version 4.2 and Zsh in 4.3.12.

How would I do negative length parameter expansion in Bash or Zsh if 
my version doesn't support it?

Thorsten

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