Question 1

How do I validate an email address using lpeg_patterns?

Accepted Answer

Use the 'email' pattern from the email module. Import it in your Lua code, then apply the pattern to the input string. On success, it returns captures for the local part and domain, ensuring strict RFC 5322 compliance.

Question 2

lpeg_patterns vs traditional Lua regex for parsing: which is better?

Accepted Answer

lpeg_patterns is better for correctness with RFC standards, as it handles complex edge cases that regex might miss. Lua string patterns are faster for simple tasks, but lpeg_patterns is essential for security-sensitive or specification-compliant validation.

Question 3

Is lpeg_patterns suitable for real-time data processing?

Accepted Answer

It can be used, but LPEG may introduce performance overhead compared to lighter solutions. Benchmark for your use case; it's ideal for accuracy over speed in scenarios like log parsing or input validation.

Question 4

How to parse HTTP headers with lpeg_patterns?

Accepted Answer

Use patterns from the http module, such as 'header_field' for individual headers. However, note that the HTTP APIs are non-stable, so handle with care and expect potential changes in updates.

Question 5

Can I extend lpeg_patterns for custom data formats?

Accepted Answer

Yes, but it requires LPEG knowledge. You can compose existing patterns or write new ones using LPEG, but the library doesn't provide tools for custom formats, focusing on internet standards.

Question 6

What dependencies does lpeg_patterns have?

Accepted Answer

It depends on the LPEG library for Lua. Ensure LPEG is installed and configured in your environment, as the patterns won't work without it, adding an external dependency.

lpeg_patterns

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