How to check if a string contains a substring in Bash

Here are the couple of methods to check if a string contains a substring in bash shell script.

Methods to check if string contains a substring in Bash

Method 1: Use regular expression

#!/bin/bash
str='Techieroop: Solution for DevOps & Open Source Technology'
if [[ $str =~ "DevOps" ]]; then
  echo "String is there!"
else
  echo "String is not there"
fi

Output:

String is there!

Method 2: Use wildcard (*) to check the string

#!/bin/bash
str='Techieroop: Solution for DevOps & Open Source Technology'
if [[ $str == *"DevOps"* ]]; then
  echo "String is there!"
else
  echo "String is not there"
fi

Output:

String is there!