Regular expressions (or regex) offer a way to look into a text file, a form, or a command line output and locate strings that match a specific pattern. This allows you to extract emails, phone numbers, keys that match a given structure, etc. You can think of regex as a search function on steroids....
Basic or extended regex?
Regular expressions (regex) come in several flavours. The two main ones you will come across are: – Basic Regular Expressions (BRE) – Extended Regular Expressions (ERE) From a practical standpoint, the main difference between the two lies in the way they handle special characters. These characters perform a special task or give a certain...