Good stuff! Has the potential be very useful for newbies.
"5. Don't use regexes for formats without a definite syntaxis, like human language. Regexes are good for pattern matching (and substitution), not for langague analyzing."
Think you have to be a bit more specific here.
Computer languages have a definte syntax but using regular expressions to parse them can be a very painful process. (I Know this from experience cause I once tried to make a code beautifier for C++ and Pascal). In those cases a proper parser (say Parse::RecDescent) is much better.
If you are just trying to find simple things in source code, for instance #include statements or simply formatted comment blocks, regular expressions would be fine.
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