The first is a syntax error which caused the perl on my machine (Activeperl 5.8.8 build 822) to spit out: 
panic: ck_grep at C:/Documents and Settings/bri/workspace/PerlMonks/te
+mp.pl
    line 10 (#1)
    (P) Failed an internal consistency check trying to compile a grep.
    
Uncaught exception from user code:
    panic: ck_grep at C:/Documents and Settings/bri/workspace/PerlMonk
+s/temp.pl lin
e 10.
 at C:/Documents and Settings/bri/workspace/PerlMonks/temp.pl line 10

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What did you really mean it to say?

In reply to Re: Confusing grep behavior by FunkyMonk
in thread Confusing grep behavior by dextius

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