Hi Viktor and Dominic,

If I do the following on Ubuntu 16.04 LTS:

    $ echo "1 2" | egrep '[[:digit:]]\s[[:digit:]]’
    1 2

… where “1 2” are highlighted in bash

Am I correct that since this POSIX regex for the digits AND the \s is still 
being interpreted, my system must support the GNU regex extensions ?

Thanks,

- J

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