Regular expressions in C

Using glibc's regex.h

• Make sure the number of expected matches (nmatch) is high enough, or there will be garbage at the end of the matchptr array
  

• If regexec() succeeds [returns zero], matchptr contains:
• 0: the whole regex
• 1: first parenthesis match
• if regexec() fails [returns a value], don't even look in matchptr

• Characters that must be escaped:
• parentheses
• plus signs
• If you're matching the end of line, it must be inside any parenthesis!
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