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Re: built-in regex matches wrong character


From: Chet Ramey
Subject: Re: built-in regex matches wrong character
Date: Thu, 6 Sep 2018 10:13:45 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 9/5/18 2:50 PM, address@hidden wrote:

> Bash Version: 4.4
> Patch Level: 0
> Release Status: release
> 
> Description:
>       It seems like bash built-in regex matches some symbols that shouldn't. 

There are a couple of things to consider here.

1. Bash doesn't have a "built-in" regexp engine. It uses whatever POSIX-
   compatible regexp API the C library provides.

2. POSIX range expressions are explicitly non-portable and locale-
   dependent. The characters in a range depend on the locale's collation
   sequence. Look back at this list for discussions of how upper and
   lower case letters get into a range like a-z.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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