regcomp.c: Change lookup for dumping pattern

Instead of using a bunch of branches, use strchr() to see if a
character is a member of a class.  This is a common paradigm in the
parsers.

diff --git a/regcomp.c b/regcomp.c
index 54d641d..f9d56c1 100644 (file)
--- a/regcomp.c
+++ b/regcomp.c
@@ -119,8 +119,7 @@ typedef struct scan_frame {
 
 /* Certain characters are output as a sequence with the first being a
  * backslash. */
-#define isBACKSLASHED_PUNCT(c)                                              \
-                    ((c) == '-' || (c) == ']' || (c) == '\\' || (c) == '^')
+#define isBACKSLASHED_PUNCT(c)  strchr("-]\\^", c)
 
 
 struct RExC_state_t {