1POSIX regex snarfed from Doug McIlroy's C++. Converted to C by Glenn 2Fowler. *'d features have been added to Doug's original code. testre 3should compile with other regex implementations, but you may need to 4run with -c to catch non-terminating loops and memory faults. 5 6FEATURE BRE ERE ARE 7------- --- --- --- 8negation NO expr \! expr ! 9conjunction NO expr \& expr expr & expr 10NULL subgroups YES NO YES 11word boundaries* \< expr \> \< expr \> < expr > 12minimal match* NO REG_MINIMAL REG_MINIMAL 13shell patterns* REG_SHELL NO NO 14ksh patterns* NO NO REG_SHELL 15