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different awk behaviour

different awk behaviour

(OP)

on AIX:
$ echo 123.123.123.123|awk -F. '$0~/^([0-9]{1,3}\.){3}[0-9]{1,3}$/'
123.123.123.123
$

on Redhat:
$ echo 123.123.123.123|awk -F. '$0~/^([0-9]{1,3}\.){3}[0-9]{1,3}$/'
$

why on redhad regex in awk does not work like on aix?

RE: different awk behaviour

(OP)
it works with --posix on redhat

$ echo 123.123.123.123|awk --posix -F. '$0~/^([0-9]{1,3}\.){3}[0-9]{1,3}$/'
123.123.123.123

I am just looking for something working in both AIX and Redhat (--posix switch is not option on AIX and command fails)

RE: different awk behaviour

Hi

Is that Awk on RedHat a GNU Awk older than 4.0.0 ? Because those not processed regular expression intervals ( those quantifiers in braces ), unless --re-interval switch was used. ( Or the --posix you already discovered. )

If that is the case, as far as I know your only portable option is to not use intervals : [0-9]{1,3} -> [0-9][0-9]?[0-9]?

Feherke.
feherke.ga

RE: different awk behaviour

(OP)
thank you. brilliant!

$ echo 23.3.23.1|awk -F. '$0~/^[0-9][0-9]?[0-9]?\.[0-9][0-9]?[0-9]?\.[0-9][0-9]?[0-9]?\.[0-9][0-9]?[0-9]?$/'
23.3.23.1

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