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Bash - check if string contains substring

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Created by:

Zeeshan-Peel

850

In this article, we would like to show you how to check if string contains substring in Bash.

1. Using Wildcards

Edit

The simplest way to check if a string contains given substring is by using Bash wildcards.

xxxxxxxxxx
 
#!/bin/bash
​
string='Example text...'
substring='text'
​
if [[ "$string" == *"$substring"* ]]; then
    echo "The string contains the substring."
fi

Run in command line:

xxxxxxxxxx
 
./script.sh

Output:

xxxxxxxxxx
 
The string contains the substring.

2. Using Regex

Edit

Another simple solution is to use regex operator (=~).

xxxxxxxxxx
 
#!/bin/bash
​
string='Example text...'
substring='text'
​
if [[ "$string" =~ .*"$substring".* ]]; then
    echo "The string contains the substring."
fi

Run in command line:

xxxxxxxxxx
 
./script.sh

Output:

xxxxxxxxxx
 
The string contains the substring.

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Bash - check if string contains substring

1. Using Wildcards

2. Using Regex

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