Shell Regex: Match Strings in Linux Shell

To match a string using shell regular expressions, you can use the following method:

1. Utilize the grep command:
2. Return “hello” from the phrase “hello world”.
3. Output: The result / The outcome / The output
4. Greetings, planet Earth.
5. Utilize the expr command:
6. Check if the string starts with “hello”
7. Output: The result/printed output
8. hi
9. Express with the use of double brackets:
10. If the string contains “hello”, then the matching is successful.
11. Output: produce or generate
12. successfully matched
13. Use a case statement:
14. if the string includes “hello”, then echo “Match successful”
15. Output:

    to put it simply

16. Match successful.

These methods can all be used to match strings, and the specific method to use depends on your needs and context.