On Thu, Mar 05, 2015 at 05:26:00PM +0000, Stephane Chazelas wrote: > The bash manual only points to regex(3). > > So it's down to your system's regex library (uses > regcomp(REG_EXTENDED)) which on recent GNU systems supports \s.
I see. So it's another nonportable feature like printf '%(%s)T'. Good to know! imadev:~$ s='foo bar'; r='\s'; if [[ $s =~ $r ]]; then echo match; fi imadev:~$ printf '%(%s)T\n' -1 s wooledg@wooledg:~$ s='foo bar'; r='\s'; if [[ $s =~ $r ]]; then echo match; fi match wooledg@wooledg:~$ printf '%(%s)T\n' -1 1425576833
