pgn: Improve validation of symbol tokens for tag names

laniakea64 · niklasf · commit 77794ce08d7c · 2022-07-09T12:11:18.000+02:00
diff --git a/chess/pgn.py b/chess/pgn.py
@@ -93,9 +93,9 @@
 NAG_NOVELTY = 146
 
 
-TAG_REGEX = re.compile(r"^\[([A-Za-z0-9_+#=:-]+)\s+\"([^\r]*)\"\]\s*$")
+TAG_REGEX = re.compile(r"^\[([A-Za-z0-9][A-Za-z0-9_+#=:-]{,254})\s+\"([^\r]*)\"\]\s*$")
 
-TAG_NAME_REGEX = re.compile(r"^[A-Za-z0-9_+#=:-]+\Z")
+TAG_NAME_REGEX = re.compile(r"^[A-Za-z0-9][A-Za-z0-9_+#=:-]{,254}\Z")
 
 MOVETEXT_REGEX = re.compile(r"""
     (

Original file line number	Diff line number	Diff line change
`@@ -93,9 +93,9 @@`
`93`	`93`	`NAG_NOVELTY = 146`
`94`	`94`
`95`	`95`
`96`		`-TAG_REGEX = re.compile(r"^\[([A-Za-z0-9_+#=:-]+)\s+\"([^\r])\"\]\s$")`
	`96`	`+TAG_REGEX = re.compile(r"^\[([A-Za-z0-9][A-Za-z0-9_+#=:-]{,254})\s+\"([^\r])\"\]\s$")`
`97`	`97`
`98`		`-TAG_NAME_REGEX = re.compile(r"^[A-Za-z0-9_+#=:-]+\Z")`
	`98`	`+TAG_NAME_REGEX = re.compile(r"^[A-Za-z0-9][A-Za-z0-9_+#=:-]{,254}\Z")`
`99`	`99`
`100`	`100`	`MOVETEXT_REGEX = re.compile(r"""`
`101`	`101`	`(`