How to Regex: A Practical Guide to Regular Expressions (Regex) for Hackers
Blog post from Bugcrowd
Regular Expressions (regex) are a powerful tool for searching and manipulating text patterns. Once mastered, regex can greatly improve efficiency in everyday tasks such as parsing URLs, filtering large chunks of text, and validating input data. A key concept in regex is the use of quantifiers to specify how many times a pattern should be matched, with common quantifiers including `*` (zero or more), `+` (one or more), and `?` (once or not at all). Lookbehinds and lookaheads can also be used to check for specific conditions without including them in the match. Additionally, regex can be used to bypass security controls by exploiting edge cases, and it's generally recommended to use allowlists instead of custom regex for input validation. With practice and patience, developers can become proficient in using regex to extract useful information from text data.
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