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

[Thomas Dignan]

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

/lib64/ld
linux
x86
64.so.2

The expected result is:

/lib64/ld-linux-x86-64.so.2

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\.\-]*'

/lib64/ld-linux-x86-64.so.2

The expected result is obtained.

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

Thanks,
Tom