[Tips] What is regex and why do the developer should to learn it?

Regular expression is a special text string for describing a search pattern. You can think of regular expressions as wildcards on steroids. You are probably familiar with wildcard notations such as *.txt to find all text files in a file manager. The regex equivalent is .*\.txt. But you can do much more with regular expressions. In a text editor like Notepad++, you could use the

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