Linux /bin/sh check if string contains X

Question

In a shell script, how can I find out if a string is contained within another string. In bash, I would just use =~, but I am not sure how I can do the same in /bin/sh. Is i

Answer 1

You can try lookup 'his' in 'This is a test'

TEST="This is a test"
if [ "$TEST" != "${TEST/his/}" ]
then
echo "$TEST"
fi