fix(linter): 🐛 yaml parser with escape in regex

internal/model/parser.go

@@ -24,6 +24,8 @@ func Parse(path string) (*Pipeline, error) {
 
 // ParseBytes parses YAML from an in-memory byte slice.
 func ParseBytes(data []byte) (*Pipeline, error) {
+	data = sanitizeYAMLEscapes(data)
+
 	// First pass: parse into a yaml.Node document to extract job keys with
 	// their exact source line numbers (key nodes carry the line, value nodes
 	// carry the body we decode into Job / map[string]any).
@@ -75,3 +77,63 @@ func ParseBytes(data []byte) (*Pipeline, error) {
 
 	return p, nil
 }
+
+// sanitizeYAMLEscapes rewrites double-quoted YAML strings, replacing the \/
+// escape sequence (unrecognised by gopkg.in/yaml.v3) with \\/ so that the
+// parser produces a literal backslash+slash — preserving regex patterns like
+// /^us\// that appear in GitLab CI if: expressions.
+func sanitizeYAMLEscapes(data []byte) []byte {
+	type state int
+	const (
+		stOutside state = iota
+		stSingleQ
+		stDoubleQ
+		stEscape
+	)
+
+	out := make([]byte, 0, len(data))
+	s := stOutside
+
+	for i := 0; i < len(data); i++ {
+		b := data[i]
+		switch s {
+		case stOutside:
+			out = append(out, b)
+			switch b {
+			case '"':
+				s = stDoubleQ
+			case '\'':
+				s = stSingleQ
+			}
+		case stSingleQ:
+			out = append(out, b)
+			if b == '\'' {
+				if i+1 < len(data) && data[i+1] == '\'' {
+					// '' inside a single-quoted string is an escaped single-quote
+					out = append(out, data[i+1])
+					i++
+				} else {
+					s = stOutside
+				}
+			}
+		case stDoubleQ:
+			out = append(out, b)
+			switch b {
+			case '\\':
+				s = stEscape
+			case '"':
+				s = stOutside
+			}
+		case stEscape:
+			if b == '/' {
+				// \/ is not recognised by yaml.v3; rewrite as \\/ which
+				// the parser resolves to a literal backslash + slash.
+				out = append(out, '\\', '/')
+			} else {
+				out = append(out, b)
+			}
+			s = stDoubleQ
+		}
+	}
+	return out
+}