On Sun, 5 Nov 2006 19:11:06 +0100 Josh Hurst wrote: > Can I concatenate shell pattern and ~(E) pattern in one [[ str == pat > ]] expression?
there are a few issues for ~(E): the affect on the underlying matcher -- ~(E) (extended) REs are not anchored, whereas ksh REs are ~(E) puts the RE lexer into extended RE syntax, where (?K) is the syntax to switch to ksh RE mode (borrowed from perl syntax) the last mode of ~(E) or (?K) left to right determines the mode of the RE, i.e., anchoring this example should print 0 1 0 0 0 1 0 0 print $( [[ bxz == @(a|b)?z ]]; print $? [[ xbxzx == @(a|b)?z ]]; print $? [[ bxz == ~(E)(a|b).z ]]; print $? [[ xbxzx == ~(E)(a|b).z ]]; print $? [[ bxz == ~(E)(a|b)(?K)?z ]]; print $? [[ xbxzx == ~(E)(a|b)(?K)?z ]]; print $? [[ bxz == @(a|b)~(E).z ]]; print $? [[ xbxzx == @(a|b)~(E).z ]]; print $? ) -- Glenn Fowler -- AT&T Research, Florham Park NJ --
