Lua Pattern Syntax
Learn character classes %d, %a, %s, anchors, and quantifiers in Lua patterns.
Lua Patterns vs Regex
Lua uses its own pattern language, not full POSIX regex. It is simpler and faster, but lacks alternation (|) and lookaheads.
Character Classes
%d digit, %a letter, %l lowercase, %u uppercase, %s whitespace, %p punctuation, %w alphanumeric. Uppercase negates: %D = non-digit.