warn about /(?p{})/ (from Simon Cozens)

p4raw-id: //depot/perl@5475

2 files changed, 5 insertions, 2 deletions

diff --git a/regcomp.c b/regcomp.c
index f4fcaa9073..a1272ebfc7 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -1734,6 +1734,9 @@ S_reg(pTHX_ I32 paren, I32 *flagp)
 		nextchar();
 		*flagp = TRYAGAIN;
 		return NULL;
+	    case 'p':
+		Perl_warner(aTHX_ WARN_REGEXP, "(?p{}) is deprecated - use (??{})");
+		/* FALL THROUGH*/
 	    case '?':
 		logical = 1;
 		paren = *PL_regcomp_parse++;
diff --git a/toke.c b/toke.c
index 3af0896349..79ee972e02 100644
--- a/toke.c
+++ b/toke.c
@@ -1269,8 +1269,8 @@ S_scan_const(pTHX_ char *start)
 	    if (s[2] == '#') {
 		while (s < send && *s != ')')
 		    *d++ = *s++;
-	    } else if (s[2] == '{'
-		       || s[2] == '?' && s[3] == '{') {	/* This should march regcomp.c */
+	    } else if (s[2] == '{' /* This should match regcomp.c */
+		       || (s[2] == 'p' || s[2] == '?') && s[3] == '{') {	
 		I32 count = 1;
 		char *regparse = s + (s[2] == '{' ? 3 : 4);
 		char c;