Correct fix for experimental POSIX pattern translation.

src/pcre2_convert.c

@@ -279,12 +279,15 @@ while (plength > 0)
     /* Fall through */ 
     
     case CHAR_ASTERISK:
+    case CHAR_DOT:
+    case CHAR_CIRCUMFLEX_ACCENT:
+    case CHAR_DOLLAR_SIGN:   
     if (p + 1 > endp) return PCRE2_ERROR_NOMEMORY;
     *p++ = sc;
     break;  
     
     default:
-    if (c < 256 && strchr("\\{}?*+[]()|", c) != NULL)
+    if (c < 256 && strchr("\\{}?*+[]()|.^$", c) != NULL)
       {
       PUTCHARS(STR_BACKSLASH);
       }

testdata/testinput24

@@ -257,9 +257,9 @@
 \= Expect no match
     a1b
 
-/how.to/
+/how.to how\.to/
 
-/^how to/
+/^how to \^how to/
 
 #pattern convert=unset
 

testdata/testoutput24

@@ -411,11 +411,11 @@ a*b\+c+[def]\(ab\)(cd)
     a1b
 No match
 
-/how.to/
-how.to
+/how.to how\.to/
+how.to how\.to
 
-/^how to/
-^how to
+/^how to \^how to/
+^how to \^how to
 
 #pattern convert=unset