Regular expressions are extremely useful in extracting information from text such as code, log files, spreadsheets, or even documents. As an unix administrator we do regularly use the regex to perform various problem diagnosis , automation or remediation tasks. And it is almost impossible to imagine the life of unixadmin without RegEx usage. This quick virtual lab session will give you the basic usage knowledge of regular expressions with grep, which is a essential skill required for unix system administrators.
Below is the Learning Map, that makes you comfortable with Grep and RegEx ( i.e. Regular Expressions) within a day: