that's itAn emphatic way to point out or confirm something, often meaning “exactly” or “that's the one.” นั่นแหละ is the more common spelling; แหล่ะ is a colloquial variant.
that's exactly itA conversational emphatic expression meaning “that one,” “that’s it,” or “right there,” depending on context. The standard spelling is นั่นแหละ.
TH: ใช่ คนนี้นั่นแหล่ะที่ช่วยฉัน
EN: Yes, this is exactly the person who helped me.