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regex Regular expressions is a medium rated room by concatenate. I will only be posting the answers here as the creator of the room has done an awesome job of explaining about the regular expression on the room. So I suggest you to play with regex on the room on your own before looking the answers.

Task 1 - Introduction

5

Task 2 - Charset

1

Task 3 - Wildcards and optional characters

2

Task 4 - Metacharacters and repetitions

3

Task 5 - Starts with/ ends with, groups, and either/ or

4

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