regex.sh

#!/bin/bash


#
# pastebin: https://pastebin.com/ZHqY5h9L
#
# created by OuNiS 07.2024
#
# https://stackoverflow.com/questions/35919103/how-do-i-use-a-regex-in-a-shell-script

DATE_2_CHECK='^[0-9]{2}[-.][0-9]{2}[-.][0-9]{4}$'

# set -- "28/07.2024"
# if [[ $# -eq 0 ]]; then set -- "27.04.2024"; fi;
[[ $# -eq 0 ]] && set -- "27.07.2024"

[[ $1 =~ $DATE_2_CHECK ]] && echo "Data prawidłowa $1" || echo "$1 - coś nie tak z tą datą..."