fix: allow non-ASCII characters in SSH host aliases

The userHostRe regexp only accepted ASCII letters and digits in the
host portion, rejecting valid SSH config Host aliases that contain
Chinese or other Unicode characters (e.g. "PROD-服务器"). Widen the
character classes with \p{L} and \p{N} to accept Unicode letters
and digits.

Fixes #2937

Signed-off-by: majiayu000 <1835304752@qq.com>

Author: majiayu000

pkg/remote/connutil.go

@@ -26,7 +26,7 @@ import (
 	"golang.org/x/crypto/ssh"
 )
 
-var userHostRe = regexp.MustCompile(`^([a-zA-Z0-9][a-zA-Z0-9._@\\-]*@)?([a-zA-Z0-9][a-zA-Z0-9.-]*)(?::([0-9]+))?$`)
+var userHostRe = regexp.MustCompile(`^([a-zA-Z0-9\p{L}\p{N}][a-zA-Z0-9._@\p{L}\p{N}\\-]*@)?([a-zA-Z0-9\p{L}\p{N}][a-zA-Z0-9.\p{L}\p{N}-]*)(?::([0-9]+))?$`)
 
 func ParseOpts(input string) (*SSHOpts, error) {
 	m := userHostRe.FindStringSubmatch(input)

pkg/remote/connutil_test.go

@@ -0,0 +1,52 @@
+// Copyright 2025, Command Line Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+package remote
+
+import (
+	"testing"
+)
+
+func TestParseOpts(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		wantUser string
+		wantHost string
+		wantPort string
+		wantErr  bool
+	}{
+		{"user@host:port", "user@myserver:22", "user", "myserver", "22", false},
+		{"host only", "myserver", "", "myserver", "", false},
+		{"chinese host alias", "PROD-服务器", "", "PROD-服务器", "", false},
+		{"mixed ascii and chinese with user and port", "user@PROD-阿里云:22", "user", "PROD-阿里云", "22", false},
+		{"unicode only host", "服务器", "", "服务器", "", false},
+		{"japanese host", "サーバー", "", "サーバー", "", false},
+		{"empty string", "", "", "", "", true},
+		{"just colon", ":", "", "", "", true},
+		{"just at", "@", "", "", "", true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			opts, err := ParseOpts(tt.input)
+			if tt.wantErr {
+				if err == nil {
+					t.Fatalf("expected error, got nil")
+				}
+				return
+			}
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if opts.SSHUser != tt.wantUser {
+				t.Errorf("user: got %q, want %q", opts.SSHUser, tt.wantUser)
+			}
+			if opts.SSHHost != tt.wantHost {
+				t.Errorf("host: got %q, want %q", opts.SSHHost, tt.wantHost)
+			}
+			if opts.SSHPort != tt.wantPort {
+				t.Errorf("port: got %q, want %q", opts.SSHPort, tt.wantPort)
+			}
+		})
+	}
+}