https://git.ruby-lang.org/ruby.git/commit/?id=d54a3df2e5

From d54a3df2e53a964c8bb36b87bc10ba2512830a60 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 9 Jul 2021 06:41:29 +0900
Subject: [ruby/date] Separate era from preceding word

https://github.com/ruby/date/commit/017149e53e
---
 ext/date/date_parse.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/ext/date/date_parse.c b/ext/date/date_parse.c
index 0e7067f4d8..021df3793b 100644
--- a/ext/date/date_parse.c
+++ b/ext/date/date_parse.c
@@ -694,6 +694,9 @@ parse_time(VALUE str, VALUE hash) https://github.com/ruby/ruby/blob/trunk/ext/date/date_parse.c#L694
 #endif
 }
 
+#define BEGIN_ERA "\\b"
+#define END_ERA "(?!(?<!\\.)[a-z])"
+
 #ifdef TIGHT_PARSER
 static int
 parse_era1_cb(VALUE m, VALUE hash)
@@ -705,7 +708,7 @@ static int https://github.com/ruby/ruby/blob/trunk/ext/date/date_parse.c#L708
 parse_era1(VALUE str, VALUE hash)
 {
     static const char pat_source[] =
-	"(a(?:d|\\.d\\.))";
+	BEGIN_ERA "(a(?:d\\b|\\.d\\.))" END_ERA;
     static VALUE pat = Qnil;
 
     REGCOMP_I(pat);
@@ -727,8 +730,9 @@ parse_era2_cb(VALUE m, VALUE hash) https://github.com/ruby/ruby/blob/trunk/ext/date/date_parse.c#L730
 static int
 parse_era2(VALUE str, VALUE hash)
 {
-    static const char pat_source[] =
-	"(c(?:e|\\.e\\.)|b(?:ce|\\.c\\.e\\.)|b(?:c|\\.c\\.))";
+    static const char pat_source[] = BEGIN_ERA
+	"(c(?:e\\b|\\.e\\.)|b(?:ce\\b|\\.c\\.e\\.)|b(?:c\\b|\\.c\\.))"
+	END_ERA;
     static VALUE pat = Qnil;
 
     REGCOMP_I(pat);
@@ -845,7 +849,11 @@ parse_eu(VALUE str, VALUE hash) https://github.com/ruby/ruby/blob/trunk/ext/date/date_parse.c#L849
 		 "(?:"
 		   "\\s*"
 #ifndef TIGHT_PARSER
-		   "(c(?:e|\\.e\\.)|b(?:ce|\\.c\\.e\\.)|a(?:d|\\.d\\.)|b(?:c|\\.c\\.))?"
+		   "(?:"
+		     BEGIN_ERA
+		     "(c(?:e|\\.e\\.)|b(?:ce|\\.c\\.e\\.)|a(?:d|\\.d\\.)|b(?:c|\\.c\\.))"
+		     END_ERA
+		   ")?"
 		   "\\s*"
 		   "('?-?\\d+(?:(?:st|nd|rd|th)\\b)?)"
 #else
-- 
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