1 files changed, 3 insertions, 3 deletions
diff --git a/mystringlistunit.pas b/mystringlistunit.pas
index af03f4a..31f9af5 100644
--- a/mystringlistunit.pas
+++ b/mystringlistunit.pas
@@ -25,7 +25,7 @@ type
     procedure saveToGz(const s: ansiString);
     function readln(out s: string): boolean; inline;
     function metaReadln(out s: string; subRoutine: boolean): boolean; inline;
-    procedure grep(expr: string);
+    procedure grep(expr: string; invert: boolean = false);
     function grepFirst(expr: string): string;
     function hatZeile(zeile: string): boolean; // invers zu "grep -c"
     function eof: boolean;
@@ -185,7 +185,7 @@ begin
   result:=readln(s);
 end;
 
-procedure tMyStringlist.grep(expr: string);
+procedure tMyStringlist.grep(expr: string; invert: boolean);
 var
   re: tRegExpr;
   i:  longint;
@@ -193,7 +193,7 @@ begin
   re:=tRegExpr.create;
   re.expression:=expr;
   for i:=count-1 downto 0 do
-    if not re.exec(self[i]) then
+    if not invert xor re.exec(self[i]) then
       delete(i);
   re.free;
 end;