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bug#10030: grep: strange behavior with '-' in character class

From: Thomas Dignan
Subject: bug#10030: grep: strange behavior with '-' in character class
Date: Sat, 12 Nov 2011 14:18:02 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110419 Thunderbird/3.1.9

I have since learned that you are not supposed to escape things within brackets at all and simply position them so they have relevant meaning, and that dot does not need to be escaped inside brackets.

Not sure if my mail is still relevant.

On 11/12/2011 02:05 PM, Thomas Dignan wrote:
Hello Coreutils Team,

When I use the command:

echo "/lib64/ld-linux-x86-64.so.2" | grep -o '[a-zA-Z\/0-9\-\.]*'

The result is that I get a tokenized string where - has been replaced with \n


The expected result is:


When the character class is modified so that the - is not next to the number 9:

echo "/lib64/ld-linux-x86-64.so.2" | grep -o '[a-zA-Z\/0-9\.\-]*'


The expected result is obtained.

I am aware - is used to specify a range, but it is escaped, should this be the proper behaviour?


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