Improve detection of escaped strings with embedded backslash escapes

Author: kmurray

src/sdc_lexer.l

@@ -62,7 +62,7 @@ ID_MID ({ALPHA}|{DIGIT10}|{SYMBOL})
 ID_INDEX (\[{DIGIT10}+\])
 ID ({ID_FIRST}{ID_MID}*{ID_INDEX}?)
 STR ({ID}|\*{ID}?)
-ESCAPED_STR (\{{WS}*{STR}{WS}*\})
+ESCAPED_STR (\{{WS}*[^ \t]*{WS}*\})
 
 /*
  * Symbol Definitions

test_sdcs/test_escape.sdc

@@ -0,0 +1,19 @@
+#VPR compatible SDC file for benchmark circuit 'radar20'
+
+# Creates an external virtual clock 'virtual_io_clock', and non-virtual clocks for each netlist clock (each with 1ns target clock period).
+# Paths between netlist clock domains are not analyzed, but paths to/from the 'virtual_io_clock' and netlist clocks are analyzed.
+
+#**************************************************************
+# Unit Information
+#**************************************************************
+#VPR assumes time unit is nanoseconds
+
+#**************************************************************
+# Create Clock
+#**************************************************************
+create_clock -period 1.000 -name virtual_io_clock
+create_clock -period 1.000 {n101}
+create_clock -period 1.000 {clock}
+create_clock -period 1.000 {clk[0]}
+create_clock -period 1.000 {clk\[0\]}
+create_clock -period 1.000 {obj_q:obj_q\|altclklock0_wrap:b2v_inst10\|altclklock0:component1\|altpll:altpll_component\|altpll_bnf2:auto_generated\|clk\[0\]}