Most of my opcode talk is about regexes. Here's a regex opcode primer for you:

• regnodes.h lists all the regex opcodes, their "names" (like STAR and SUSPEND and IFMATCH), their size (how many "nodes" does each opcode take up), and some other useful info
• pod/perldebguts.pod has a section on regex debugger output (available via -Dr if you compiled Perl with debugging, and via use re 'debug' otherwise)
• regcomp.c and regexec.c hold the meat of the regex engine -- these two beasts are the compiler and executor of regexes, so they're probably very daunting (trust me)

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
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