diff --git a/src/Path.ts b/src/Path.ts
index 2e7159e..38e0ecf 100644
--- a/src/Path.ts
+++ b/src/Path.ts
@@ -329,7 +329,7 @@ export class Path<T extends Record<string, any> = Record<string, any>> {
 
   private getParams(type: string | RegExp): string[] {
     const predicate =
-      type instanceof RegExp
+      typeof type !== 'string'
         ? (t: Token) => type.test(t.type)
         : (t: Token) => t.type === type
 
diff --git a/src/tokeniser.ts b/src/tokeniser.ts
index af7b215..f330a6e 100644
--- a/src/tokeniser.ts
+++ b/src/tokeniser.ts
@@ -21,7 +21,7 @@ const tokenise = (str: string, tokens: Token[] = []): Token[] => {
       match: match[0],
       val: match.slice(1, 2),
       otherVal: match.slice(2),
-      regex: rule.regex instanceof Function ? rule.regex(match) : rule.regex
+      regex: typeof rule.regex === 'function' ? rule.regex(match) : rule.regex
     })
 
     if (match[0].length < str.length) {