bash "=~" example
$ [[ 45 =~ [0-9]+ ]] && echo "45 contains digits"
45 contains digits
$ [[ "hello" =~ [0-9]+ ]] && echo "hello doesnt contains digits"
$ [[ "hello" =~ [a-z]+ ]] && echo "hello contains alphabets"
hello contains alphabets
bash "=~" example
$ [[ 45 =~ [0-9]+ ]] && echo "45 contains digits"
45 contains digits
$ [[ "hello" =~ [0-9]+ ]] && echo "hello doesnt contains digits"
$ [[ "hello" =~ [a-z]+ ]] && echo "hello contains alphabets"
hello contains alphabets
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