Fix bug introduced in commit 1133. Lookbehinds that follow a condition were not

always properly handled.

src/pcre2_compile.c

@@ -9549,13 +9549,22 @@ for (; *pptr != META_END; pptr++)
     break;
 
     case META_BACKREF_BYNAME:
+    case META_RECURSE_BYNAME:
+    pptr += 1 + SIZEOFFSET;
+    break;
+
     case META_COND_DEFINE:
     case META_COND_NAME:
     case META_COND_NUMBER:
     case META_COND_RNAME:
     case META_COND_RNUMBER:
-    case META_RECURSE_BYNAME:
     pptr += 1 + SIZEOFFSET;
+    nestlevel++;
+    break;
+
+    case META_COND_VERSION:
+    pptr += 3;
+    nestlevel++;
     break;
 
     case META_CALLOUT_STRING:
@@ -9576,7 +9585,6 @@ for (; *pptr != META_END; pptr++)
     break;
 
     case META_CALLOUT_NUMBER:
-    case META_COND_VERSION:
     pptr += 3;
     break;
 

testdata/testinput1

@@ -6383,4 +6383,7 @@ ef) x/x,mark
 /(?<=(?=(?<=a)))b/
     ab
 
+/^(?<A>a)(?(<A>)b)((?<=b).*)$/
+    abc
+
 # End of testinput1 

testdata/testinput2

@@ -5748,4 +5748,14 @@ a)"xI
 /\A\s*((?:[^`]{28500}){4}|a)/I
     a
 
+/(?<A>a)(?(<A>)b)((?<=b).*)/B
+
+/(?(1)b)((?<=b).*)/B
+
+/(?(R1)b)((?<=b).*)/B
+
+/(?(DEFINE)b)((?<=b).*)/B
+
+/(?(VERSION=10.4)b)((?<=b).*)/B
+
 # End of testinput2

testdata/testoutput1

@@ -10106,4 +10106,10 @@ No match
     ab
  0: b
 
+/^(?<A>a)(?(<A>)b)((?<=b).*)$/
+    abc
+ 0: abc
+ 1: a
+ 2: c
+
 # End of testinput1 

testdata/testoutput2

@@ -17294,6 +17294,99 @@ Subject length lower bound = 1
  0: a
  1: a
 
+/(?<A>a)(?(<A>)b)((?<=b).*)/B
+------------------------------------------------------------------
+        Bra
+        CBra 1
+        a
+        Ket
+        Cond
+      1 Cond ref
+        b
+        Ket
+        CBra 2
+        Assert back
+        Reverse
+        b
+        Ket
+        Any*+
+        Ket
+        Ket
+        End
+------------------------------------------------------------------
+
+/(?(1)b)((?<=b).*)/B
+------------------------------------------------------------------
+        Bra
+        Cond
+      1 Cond ref
+        b
+        Ket
+        CBra 1
+        Assert back
+        Reverse
+        b
+        Ket
+        Any*+
+        Ket
+        Ket
+        End
+------------------------------------------------------------------
+
+/(?(R1)b)((?<=b).*)/B
+------------------------------------------------------------------
+        Bra
+        Cond
+        Cond recurse 1
+        b
+        Ket
+        CBra 1
+        Assert back
+        Reverse
+        b
+        Ket
+        Any*+
+        Ket
+        Ket
+        End
+------------------------------------------------------------------
+
+/(?(DEFINE)b)((?<=b).*)/B
+------------------------------------------------------------------
+        Bra
+        Cond
+        Cond false
+        b
+        Ket
+        CBra 1
+        Assert back
+        Reverse
+        b
+        Ket
+        Any*+
+        Ket
+        Ket
+        End
+------------------------------------------------------------------
+
+/(?(VERSION=10.4)b)((?<=b).*)/B
+------------------------------------------------------------------
+        Bra
+        Cond
+        Cond false
+        b
+        Ket
+        CBra 1
+        Assert back
+        Reverse
+        b
+        Ket
+        Any*+
+        Ket
+        Ket
+        End
+------------------------------------------------------------------
+
 # End of testinput2
 Error -70: PCRE2_ERROR_BADDATA (unknown error number)
 Error -62: bad serialized data