bash script if string contains code example

Example 1: check if variable contains string bash

STRING='Hello world'
if [[ $STRING =~ "Hello" ]] ; then echo "It's here" ; fi

Example 2: checking if a substring exists in a string bash

string='Haystack';

if [[ $string =~ "Needle" ]]
then
   echo "It's there!"
fi

Example 3: bash substring test

#!/bin/bash

STR='GNU/Linux is an operating system'
SUB='Linux'

if grep -q "$SUB" <<< "$STR"; then
  echo "It's there"
fi

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