From 828cd4c145b1c4ae8c32e4256ceb809b112df851 Mon Sep 17 00:00:00 2001
From: Taylan Kammer <taylan.kammer@gmail.com>
Date: Fri, 29 May 2026 14:02:24 +0200
Subject: Strings allow "\x;" i.e. empty hex escape.

---
 docs/c1/1-parse.md       | 2 +-
 docs/c1/grammar/abnf.txt | 2 +-
 docs/c1/grammar/peg.txt  | 2 +-
 docs/c1/grammar/zbnf.txt | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/docs/c1/1-parse.md b/docs/c1/1-parse.md
index 7df2225..f6d677a 100644
--- a/docs/c1/1-parse.md
+++ b/docs/c1/1-parse.md
@@ -379,7 +379,7 @@ strings.  (Some rows use Regular Expression notation.)
     +-----------------------------------+------------------------------+
     | e                                 | ASCII Escape                 |
     +-----------------------------------+------------------------------+
-    | RE: /x([0-9a-fA-F]{2})+;/         | Arbitrary bytes in hex       |
+    | RE: /x([0-9a-fA-F]{2})*;/         | Arbitrary bytes in hex       |
     +-----------------------------------+------------------------------+
     | RE: /u[0-9a-fA-F]+;/              | Unicode scalar as UTF-8      |
     +-----------------------------------+------------------------------+
diff --git a/docs/c1/grammar/abnf.txt b/docs/c1/grammar/abnf.txt
index 7424f41..77b39f3 100644
--- a/docs/c1/grammar/abnf.txt
+++ b/docs/c1/grammar/abnf.txt
@@ -86,7 +86,7 @@ QuotStrChar   = %x00-21 / %x23-5b / %x5d-ff ; any but DQUOTE or "\"
 StringEsc     = "\" / "|" / DQUOTE / *( HTAB / SP ) LF *( HTAB / SP )
               / %s"a" / %s"b" / %s"t" / %s"n"
               / %s"v" / %s"f" / %s"r" / %s"e"
-              / %s"x" 1*( 2HEXDIG ) ";"
+              / %s"x" *( 2HEXDIG ) ";"
               / %s"u" ["0"] 1*5HEXDIG ";"
               / %s"u" "1" "0" 4HEXDIG ";"
 
diff --git a/docs/c1/grammar/peg.txt b/docs/c1/grammar/peg.txt
index 1e060ec..c391162 100644
--- a/docs/c1/grammar/peg.txt
+++ b/docs/c1/grammar/peg.txt
@@ -43,7 +43,7 @@ QuotStrChar  <- (!["\\] .)
 
 StringEsc    <- '\' / '|' / '"' / ( HTAB / SP )* LF ( HTAB / SP )*
               / 'a' / 'b' / 't' / 'n' / 'v' / 'f' / 'r' / 'e'
-              / 'x' HexByte+ ';'
+              / 'x' HexByte* ';'
               / 'u' UnicodeSV ';'
 
 HexByte      <- HEXDIG HEXDIG
diff --git a/docs/c1/grammar/zbnf.txt b/docs/c1/grammar/zbnf.txt
index 002e027..83a2394 100644
--- a/docs/c1/grammar/zbnf.txt
+++ b/docs/c1/grammar/zbnf.txt
@@ -44,7 +44,7 @@ QuotStrChar   : ~( '"' | '\' )
 
 StringEsc     : '\' | '|' | '"' | ( HTAB | SP )* LF ( HTAB | SP )*
               | '0' | 'a' | 'b' | 't' | 'n' | 'v' | 'f' | 'r' | 'e'
-              | 'x' HexByte+ ';'
+              | 'x' HexByte* ';'
               | 'u' UnicodeSV ';'
 
 HexByte       : HEXDIG HEXDIG
-- 
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