diff --git a/doc/OpenSTA.odt b/doc/OpenSTA.odt
index c5ed3e67..1e753f19 100644
Binary files a/doc/OpenSTA.odt and b/doc/OpenSTA.odt differ
diff --git a/doc/OpenSTA.pdf b/doc/OpenSTA.pdf
index baca70db..0eefeb0b 100644
Binary files a/doc/OpenSTA.pdf and b/doc/OpenSTA.pdf differ
diff --git a/tcl/Sdc.tcl b/tcl/Sdc.tcl
index adb3e2fe..b5f30896 100644
--- a/tcl/Sdc.tcl
+++ b/tcl/Sdc.tcl
@@ -975,7 +975,7 @@ proc get_ports { args } {
   return $ports
 }
 
-variable filter_regexp1 {@?([a-zA-Z_]+) *(==|=~) *([0-9a-zA-Z_\*]+)}
+variable filter_regexp1 {@?([a-zA-Z_]+) *(==|!=|=~) *([0-9a-zA-Z_\*]+)}
 variable filter_or_regexp "($filter_regexp1) +\\|\\| +($filter_regexp1)"
 variable filter_and_regexp "($filter_regexp1) +&& +($filter_regexp1)"
 
diff --git a/tcl/StaTcl.i b/tcl/StaTcl.i
index e30f38cb..43c5d8c9 100644
--- a/tcl/StaTcl.i
+++ b/tcl/StaTcl.i
@@ -2426,12 +2426,15 @@ filter_ports(const char *property,
   Sta *sta = Sta::sta();
   PortSeq filtered_ports;
   bool exact_match = stringEq(op, "==");
+  bool pattern_match = stringEq(op, "=~");
+  bool not_match = stringEq(op, "!=");
   for (const Port *port : *ports) {
     PropertyValue value(getProperty(port, property, sta));
     const char *prop = value.stringValue();
     if (prop &&
 	((exact_match && stringEq(prop, pattern))
-	 || (!exact_match && patternMatch(pattern, prop))))
+         || (not_match && !stringEq(prop, pattern))
+	 || (pattern_match && patternMatch(pattern, prop))))
       filtered_ports.push_back(port);
   }
   delete ports;
@@ -2447,13 +2450,16 @@ filter_insts(const char *property,
   Sta *sta = Sta::sta();
   cmdLinkedNetwork();
   bool exact_match = stringEq(op, "==");
+  bool pattern_match = stringEq(op, "=~");
+  bool not_match = stringEq(op, "!=");
   InstanceSeq filtered_insts;
   for (const Instance *inst : *insts) {
     PropertyValue value(getProperty(inst, property, sta));
     const char *prop = value.stringValue();
     if (prop &&
 	((exact_match && stringEq(prop, pattern))
-	 || (!exact_match && patternMatch(pattern, prop))))
+         || (not_match && !stringEq(prop, pattern))
+	 || (pattern_match && patternMatch(pattern, prop))))
       filtered_insts.push_back(inst);
   }
   delete insts;
@@ -2469,12 +2475,15 @@ filter_pins(const char *property,
   Sta *sta = Sta::sta();
   PinSeq filtered_pins;
   bool exact_match = stringEq(op, "==");
+  bool pattern_match = stringEq(op, "=~");
+  bool not_match = stringEq(op, "!=");
   for (const Pin *pin : *pins) {
     PropertyValue value(getProperty(pin, property, sta));
     const char *prop = value.stringValue();
     if (prop &&
 	((exact_match && stringEq(prop, pattern))
-	 || (!exact_match && patternMatch(pattern, prop))))
+         || (not_match && !stringEq(prop, pattern))
+	 || (pattern_match && patternMatch(pattern, prop))))
       filtered_pins.push_back(pin);
   }
   delete pins;
@@ -2675,12 +2684,15 @@ filter_timing_arcs(const char *property,
   Sta *sta = Sta::sta();
   EdgeSeq filtered_edges;
   bool exact_match = stringEq(op, "==");
+  bool pattern_match = stringEq(op, "=~");
+  bool not_match = stringEq(op, "!=");
   for (Edge *edge : *edges) {
     PropertyValue value(getProperty(edge, property, sta));
     const char *prop = value.stringValue();
     if (prop &&
 	((exact_match && stringEq(prop, pattern))
-	 || (!exact_match && patternMatch(pattern, prop))))
+         || (not_match && !stringEq(prop, pattern))
+	 || (pattern_match && patternMatch(pattern, prop))))
       filtered_edges.push_back(edge);
   }
   delete edges;