2025-12-19 1 min read
How to Match HTML Tags (Safely)
Regex is not an HTML parser. But sometimes you just need to strip tags. Here is how to do it without summoning Cthulhu.
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Regex Mastery
Tutorials & Guides
Actionable regular expression tutorials, debugging playbooks, and production-ready patterns.
2025-12-18 1 min read
The Comprehensive Guide to Regex Flags (g, i, m, s, u)
Flags change how the engine runs. We explain Global, Multiline, DotAll, Unicode, and Sticky flags in depth.
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2025-12-17 1 min read
Impossible Regex: Recursive Patterns in PCRE
They said regex can't parse HTML. They were (mostly) right. But PCRE's recursion (?R) lets you match nested structures like parentheses.
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2025-12-16 1 min read
Modern Regex: Unicode Property Escapes
Stop using ranges like [a-zA-Z]. Formatting inputs in a globalized world requires Unicode Property Escapes (\p{L}, \p{N}).
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2025-12-15 1 min read
What is Atomic Grouping (?>...)?
Dive deep into advanced regex optimization. Atomic groups discard backtracking information, significantly speeding up failed matches.
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2025-12-14 1 min read
Tutorial: Extracting Data from Server Logs
A practical guide to parsing Apache/Nginx access logs using Named Capture Groups for readable, maintainable data extraction.
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Upcoming Pattern Posts
Editorial roadmap for new pattern-focused guides. We publish these as hands-on tutorials with runnable examples.
- Planned
Regex Patterns for Financial Identifiers (IBAN, SWIFT, Routing)
Focus: Validation
- Drafting
Regex Patterns for Analytics Events and Naming Conventions
Focus: Data
- Planned
Regex Patterns for File and Path Security Hardening
Focus: Security