A more minimal fix for 20010410.006 from Hugo.

p4raw-id: //depot/perl@9682

1 files changed, 12 insertions, 9 deletions

diff --git a/regexec.c b/regexec.c
index 481ac58fb8..e358d63d5f 100644
--- a/regexec.c
+++ b/regexec.c
@@ -391,18 +391,20 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
 		     || ( (prog->reganch & ROPT_ANCH_BOL)
 			  && !PL_multiline ) );	/* Check after \n? */
 
-	if ((prog->check_offset_min == prog->check_offset_max) && !ml_anch) {
+	if (!ml_anch) {
+	  if ( !(prog->reganch & (ROPT_ANCH_GPOS /* Checked by the caller */
+				  | ROPT_IMPLICIT)) /* not a real BOL */
+	       /* SvCUR is not set on references: SvRV and SvPVX overlap */
+	       && sv && !SvROK(sv)
+	       && (strpos != strbeg)) {
+	      DEBUG_r(PerlIO_printf(Perl_debug_log, "Not at start...\n"));
+	      goto fail;
+	  }
+	  if (prog->check_offset_min == prog->check_offset_max &&
+	      !(prog->reganch & ROPT_SANY_SEEN)) {
 	    /* Substring at constant offset from beg-of-str... */
 	    I32 slen;
 
-	    if ( !(prog->reganch & ROPT_ANCH_GPOS) /* Checked by the caller */
-		 /* SvCUR is not set on references: SvRV and SvPVX overlap */
-		 && sv && !SvROK(sv)
-		 && (strpos != strbeg)) {
-		DEBUG_r(PerlIO_printf(Perl_debug_log, "Not at start...\n"));
-		goto fail;
-	    }
-	    PL_regeol = strend;			/* Used in HOP() */
 	    s = HOP3c(strpos, prog->check_offset_min, strend);
 	    if (SvTAIL(check)) {
 		slen = SvCUR(check);	/* >= 1 */
@@ -427,6 +429,7 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
 			 && memNE(SvPVX(check), s, slen)))
 		goto report_neq;
 	    goto success_at_start;
+	  }
 	}
 	/* Match is anchored, but substr is not anchored wrt beg-of-str. */
 	s = strpos;