Makes sense. Thank you both for clarifications! Was only wondering if this feature is there so I could elegantly do equivalent of perl's (small 'a', anycase 'sd', small 'f'):
$,="\n"; my $testr='1asdf 2AsdF 3AsDF 4asDf 5aSDf 6aSdf 7ASdf 8Asdf'; my @res = $testr =~ /a(?i:sd)f/g; print @res; ----- asdf asDf aSDf aSdf Thank you, Kind Regards ~Maciek On 4 January 2016 at 03:58, Tom Lane <t...@sss.pgh.pa.us> wrote: > matshyeq <matsh...@gmail.com> writes: > > I can see postgresql claims to supports regular expression flags: > > Yup. > > > What I find don't makes sense to me is that those flags could be used to > > switch on/off match feature locally as opposed to the whole regex (same > as > > though flags parameters of regex functions). > > Not all of them would make sense locally; in fact I'd venture that > case-sensitivity is the *only* flag that anyone would consider using > that way. > > > Perl supports that locality while postgres documentation says: > > "*An ARE can begin with embedded options: a sequence (?xyz) (where xyz is > > one or more alphabetic characters) specifies options affecting the rest > of > > the RE. > > Right. It says "begin with" and it means "begin with". > > We are not Perl and are not attempting to be bug-compatible with its regex > engine. If you want bug-compatibility, see PL/Perl. > > regards, tom lane >
