bashCheck if a string contains a substring

string="Haystack with a needle"
if [[ $string == *"needle"* ]]; then echo "Found"; fictrl + cyoutubegithub

`string="Haystack with a needle"` test string to search in	`"needle"` substring we're searching for in a test string
`echo "Found"` replace with any code that should be executed if the string contains required substring