DD/MM/YYYY regex 1

[w5000]

hello,
what is wrong in that regex that it does not work in bash, ksh, grep?

^(((0[1-9]|[12]\d|3[01])\/(0[13578]|1[02])\/((19|[2-9]\d)\d{2}))|((0[1-9]|[12]\d|30)\/(0[13456789]|1[012])\/((19|[2-9]\d)\d{2}))|((0[1-9]|1\d|2[0-8])\/02\/((19|[2-9]\d)\d{2}))|(29\/02\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$

It does the job well testing on regexr but does not work in bash:

root@deb1:~# [ "${DD}" =~ ^(((0[1-9]|[12]\d|3[01])\/(0[13578]|1[02])\/((19|[2-9]\d)\d{2}))|((0[1-9]|[12]\d|30)\/(0[13456789]|1[012])\/((19|[2-9]\d)\d{2}))|((0[1-9]|1\d|2[0-8])\/02\/((19|[2-9]\d)\d{2}))|(29\/02\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$ ] && echo date
bash: syntax error near unexpected token `('

 

[feherke]

Hi

[tt]=~[/tt] is performed only inside [tt][[[/tt] .. [tt]]][/tt].

Then you could give us a few example values of $DD you wish to match, so we have a starting point before debugging all that expression...


Feherke.
feherke.ga

 

[w5000]

Like in subject, so for example 29/09/1972

 

[feherke]

Hi

Only that ? Ok. Now I had time for a deeper look.

Bash has no idea about [tt]\d[/tt], only [tt][[:digit:]][/tt] works :

[teal][[[/teal] [i][green]"29/09/1972"[/green][/i] [teal]=~ ^((([/teal][purple]0[/purple][teal][[/teal][purple]1[/purple]-[purple]9[/purple][teal]]|[[/teal][purple]12[/purple][teal]][[:[/teal]digit[teal]:]]|[/teal][purple]3[/purple][teal][[/teal][purple]01[/purple][teal]])/([/teal][purple]0[/purple][teal][[/teal][purple]13578[/purple][teal]]|[/teal][purple]1[/purple][teal][[/teal][purple]02[/purple][teal]])/(([/teal][purple]19[/purple][teal]|[[/teal][purple]2[/purple]-[purple]9[/purple][teal]][[:[/teal]digit[teal]:]])[[:[/teal]digit[teal]:]][/teal]{[purple]2[/purple]}[teal]))|(([/teal][purple]0[/purple][teal][[/teal][purple]1[/purple]-[purple]9[/purple][teal]]|[[/teal][purple]12[/purple][teal]][[:[/teal]digit[teal]:]]|[/teal][purple]30[/purple][teal])/([/teal][purple]0[/purple][teal][[/teal][purple]13456789[/purple][teal]]|[/teal][purple]1[/purple][teal][[/teal][purple]012[/purple][teal]])/(([/teal][purple]19[/purple][teal]|[[/teal][purple]2[/purple]-[purple]9[/purple][teal]][[:[/teal]digit[teal]:]])[[:[/teal]digit[teal]:]][/teal]{[purple]2[/purple]}[teal]))|(([/teal][purple]0[/purple][teal][[/teal][purple]1[/purple]-[purple]9[/purple][teal]]|[/teal][purple]1[/purple][teal][[:[/teal]digit[teal]:]]|[/teal][purple]2[/purple][teal][[/teal][purple]0[/purple]-[purple]8[/purple][teal]])/[/teal][purple]02[/purple][teal]/(([/teal][purple]19[/purple][teal]|[[/teal][purple]2[/purple]-[purple]9[/purple][teal]][[:[/teal]digit[teal]:]])[[:[/teal]digit[teal]:]][/teal]{[purple]2[/purple]}[teal]))|([/teal][purple]29[/purple][teal]/[/teal][purple]02[/purple][teal]/(([/teal][purple]1[/purple][teal][[/teal][purple]6[/purple]-[purple]9[/purple][teal]]|[[/teal][purple]2[/purple]-[purple]9[/purple][teal]][[:[/teal]digit[teal]:]])([/teal][purple]0[/purple][teal][[/teal][purple]48[/purple][teal]]|[[/teal][purple]2468[/purple][teal]][[/teal][purple]048[/purple][teal]]|[[/teal][purple]13579[/purple][teal]][[/teal][purple]26[/purple][teal]])|(([/teal][purple]16[/purple][teal]|[[/teal][purple]2468[/purple][teal]][[/teal][purple]048[/purple][teal]]|[[/teal][purple]3579[/purple][teal]][[/teal][purple]26[/purple][teal]])[/teal][purple]00[/purple][teal]))))[/teal]$ [teal]]] &&[/teal] echo date

Similar problem in [tt]grep[/tt] with the default basic regular expressions, just it requires some additional escaping :

grep [i][green]'^[/green][/i][lime]\(\(\([/lime][i][green]0[1-9][/green][/i][lime]\|[/lime][i][green][12][[:digit:]][/green][/i][lime]\|[/lime][i][green]3[01][/green][/i][lime]\)[/lime][i][green]/[/green][/i][lime]\([/lime][i][green]0[13578][/green][/i][lime]\|[/lime][i][green]1[02][/green][/i][lime]\)[/lime][i][green]/[/green][/i][lime]\(\([/lime][i][green]19[/green][/i][lime]\|[/lime][i][green][2-9][[:digit:]][/green][/i][lime]\)[/lime][i][green][[:digit:]][/green][/i][lime]\{[/lime][i][green]2[/green][/i][lime]\}\)\)\|\(\([/lime][i][green]0[1-9][/green][/i][lime]\|[/lime][i][green][12][[:digit:]][/green][/i][lime]\|[/lime][i][green]30[/green][/i][lime]\)[/lime][i][green]/[/green][/i][lime]\([/lime][i][green]0[13456789][/green][/i][lime]\|[/lime][i][green]1[012][/green][/i][lime]\)[/lime][i][green]/[/green][/i][lime]\(\([/lime][i][green]19[/green][/i][lime]\|[/lime][i][green][2-9][[:digit:]][/green][/i][lime]\)[/lime][i][green][[:digit:]][/green][/i][lime]\{[/lime][i][green]2[/green][/i][lime]\}\)\)\|\(\([/lime][i][green]0[1-9][/green][/i][lime]\|[/lime][i][green]1[[:digit:]][/green][/i][lime]\|[/lime][i][green]2[0-8][/green][/i][lime]\)[/lime][i][green]/02/[/green][/i][lime]\(\([/lime][i][green]19[/green][/i][lime]\|[/lime][i][green][2-9][[:digit:]][/green][/i][lime]\)[/lime][i][green][[:digit:]][/green][/i][lime]\{[/lime][i][green]2[/green][/i][lime]\}\)\)\|\([/lime][i][green]29/02/[/green][/i][lime]\(\([/lime][i][green]1[6-9][/green][/i][lime]\|[/lime][i][green][2-9][[:digit:]][/green][/i][lime]\)\([/lime][i][green]0[48][/green][/i][lime]\|[/lime][i][green][2468][048][/green][/i][lime]\|[/lime][i][green][13579][26][/green][/i][lime]\)\|\(\([/lime][i][green]16[/green][/i][lime]\|[/lime][i][green][2468][048][/green][/i][lime]\|[/lime][i][green][3579][26][/green][/i][lime]\)[/lime][i][green]00[/green][/i][lime]\)\)\)\)[/lime][i][green]$'[/green][/i] [teal]<<<[/teal] [i][green]"29/09/1972"[/green][/i] [teal]&&[/teal] echo date

If your [tt]grep[/tt] supports extended regular expressions, then you can use the same regular expression as in Bash :

grep -E [i][green]'^(((0[1-9]|[12][[:digit:]]|3[01])/(0[13578]|1[02])/((19|[2-9][[:digit:]])[[:digit:]]{2}))|((0[1-9]|[12][[:digit:]]|30)/(0[13456789]|1[012])/((19|[2-9][[:digit:]])[[:digit:]]{2}))|((0[1-9]|1[[:digit:]]|2[0-8])/02/((19|[2-9][[:digit:]])[[:digit:]]{2}))|(29/02/((1[6-9]|[2-9][[:digit:]])(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$'[/green][/i] [teal]<<<[/teal] [i][green]"29/09/1972"[/green][/i] [teal]&&[/teal] echo date

If your [tt]grep[/tt] supports Perl regular expressions, then you can use your original regular expression, with [tt]\d[/tt] :

grep -P [i][green]'^(((0[1-9]|[12][/green][/i][lime]\d[/lime][i][green]|3[01])/(0[13578]|1[02])/((19|[2-9][/green][/i][lime]\d[/lime][i][green])[/green][/i][lime]\d[/lime][i][green]{2}))|((0[1-9]|[12][/green][/i][lime]\d[/lime][i][green]|30)/(0[13456789]|1[012])/((19|[2-9][/green][/i][lime]\d[/lime][i][green])[/green][/i][lime]\d[/lime][i][green]{2}))|((0[1-9]|1[/green][/i][lime]\d[/lime][i][green]|2[0-8])/02/((19|[2-9][/green][/i][lime]\d[/lime][i][green])[/green][/i][lime]\d[/lime][i][green]{2}))|(29/02/((1[6-9]|[2-9][/green][/i][lime]\d[/lime][i][green])(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$'[/green][/i] [teal]<<<[/teal] [i][green]"29/09/1972"[/green][/i] [teal]&&[/teal] echo date

Note that escaping the slashes ( / ) is required by the languages where regular expression literals are delimited with slashes. So in none of the above cases.


Feherke.
feherke.ga

 

[w5000]

brilliant!
thank you.