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BASH - Strings - Check if a String contains a Substring

string='My long string'
if [[ $string == *"My long"* ]]; then
  echo "It's there!"
fi

NOTE: Spaces in the Substring need to be placed between double quotes.

The * asterisks should be outside the double quotes.

A simple comparison operator is used (i.e. ==), not the regex operator =~.