In FilterExpr::lex allow '.' in key = value filter

The current lexer doesn't allow the . in the filter
  name =~ tcdm_master_.*req_.*_i

Signed-off-by: Matt Liberty <mliberty@precisioninno.com>

sdc/FilterObjects.cc

@@ -119,7 +119,7 @@ FilterExpr::lex(bool bool_props_as_int)
     {std::regex("^\\s+"), Token::Kind::skip},
     {std::regex("^defined\\(([a-zA-Z_]+)\\)"), Token::Kind::defined},
     {std::regex("^undefined\\(([a-zA-Z_]+)\\)"), Token::Kind::undefined},
-    {std::regex("^@?([a-zA-Z_]+) *((==|!=|=~|!~) *([0-9a-zA-Z_\\/$\\[\\]*?]+))?"), Token::Kind::predicate},
+    {std::regex("^@?([a-zA-Z_]+) *((==|!=|=~|!~) *([0-9a-zA-Z_\\/$\\[\\]*?.]+))?"), Token::Kind::predicate},
     {std::regex("^(&&)"), Token::Kind::op_and},
     {std::regex("^(\\|\\|)"), Token::Kind::op_or},
     {std::regex("^(!)"), Token::Kind::op_inv},

sdc/test/CMakeLists.txt

@@ -25,6 +25,7 @@ sta_module_tests("sdc"
     exception_thru_net
     exception_thru_override
     exceptions
+    filter_dot
     filter_query
     genclk_advanced
     leaf_pin_filter_removal

sdc/test/sdc_filter_dot.ok

@@ -0,0 +1,2 @@
+[get_cells -filter {name =~ r.*} *]
+{name =~ tcdm_master_.*req_.*_i}

sdc/test/sdc_filter_dot.tcl

@@ -0,0 +1,15 @@
+# Test that '.' is allowed in filter predicate values.
+# Targets: FilterExpr::lex (FilterObjects.cc)
+source ../../test/helpers.tcl
+
+read_liberty ../../test/asap7_small.lib.gz
+read_verilog ../../test/reg1_asap7.v
+link_design top
+create_clock -name clk -period 500 {clk1 clk2 clk3}
+
+# Filter with dot in glob pattern value (no cells have literal '.' so no match)
+puts {[get_cells -filter {name =~ r.*} *]}
+report_object_full_names [get_cells -filter {name =~ r.*} *]
+
+# Verify filter_expr_to_postfix parses dot-containing values
+puts [sta::filter_expr_to_postfix "name =~ tcdm_master_.*req_.*_i" 0]