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different awk behaviour

different awk behaviour

different awk behaviour


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

on Redhat:
$ echo|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

it works with --posix on redhat

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

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


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]?


RE: different awk behaviour

thank you. brilliant!

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

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