Regex-Fu
summary
Concrete rules for using regular expressions with PCRE: which modifiers change matching, how greedy quantifiers and misplaced captures explode memory and backtracking, and why word classes like \w behave differently under locales and Unicode. Demonstrates escaping user input with language-specific escape functions, validating versus matching (use whitelist vs blacklist), avoiding recursion, and always testing in the same engine. Recommends live testing on regex101 and checking ECMAScript/JavaScript and POSIX engine differences.
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chapters (10)
- 0:00Introduction to regex
- 5:02Regex engines and variations
- 10:21Regex basics and syntax
- 15:41Character classes and boundaries
- 20:59Localization in regex
- 25:33Escaping special characters
- 29:12Regex modifiers
- 32:07Testing and debugging regex
- 35:45Local settings and implementations
- 37:15Q&A and closing
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