different awk behaviour 1

[w5000]

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?

 

[w5000]

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)

 

[feherke]

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 [tt]--re-interval[/tt] switch was used. ( Or the [tt]--posix[/tt] you already discovered. )

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

Feherke.
feherke.ga

 

[w5000]

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