From 1df2e56fc0ab97cd7e661b6f073eb7674c92e7d2 Mon Sep 17 00:00:00 2001
From: Coro <alejandro.coronado.n@gmail.com>
Date: Thu, 20 Aug 2026 21:19:07 -0600
Subject: [PATCH] find: accept egrep and posix-egrep regex types to match GNU

---
 src/find/matchers/regex.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/find/matchers/regex.rs b/src/find/matchers/regex.rs
index 4b85e4d5..46686150 100644
--- a/src/find/matchers/regex.rs
+++ b/src/find/matchers/regex.rs
@@ -70,6 +70,8 @@ impl FromStr for RegexType {
             "posix-extended" => Ok(Self::PosixExtended),
             // ed and sed are the same as posix-basic
             "ed" | "sed" => Ok(Self::PosixBasic),
+            // egrep and posix-egrep are the same as posix-extended
+            "egrep" | "posix-egrep" => Ok(Self::PosixExtended),
             _ => Err(ParseRegexTypeError(s.to_owned())),
         }
     }
@@ -222,4 +224,17 @@ mod tests {
         let deps = FakeDependencies::new();
         assert!(!matcher.matches(&abbbc, &mut deps.new_matcher_io()));
     }
+
+    #[test]
+    fn egrep_aliases_map_to_posix_extended() {
+        // GNU accepts egrep and posix-egrep as names for the extended syntax.
+        assert_eq!(
+            "egrep".parse::<RegexType>().unwrap(),
+            RegexType::PosixExtended
+        );
+        assert_eq!(
+            "posix-egrep".parse::<RegexType>().unwrap(),
+            RegexType::PosixExtended
+        );
+    }
 }