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Just appreciate next solution example for your code implementation:
S=finding
if[[ "$S" == *ing ]]; then //some code run if string ends with 'ing'
More generally:
if[[ "string_to_check" == regex_patten ]]; then //some code
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Use following structure:
if [[ $digit =~ [0-9] ]]; then //run if a digit included in $digit string
echo "$digit is a digit"
else
echo "oops"
fi