Use anchors and word boundaries to express exactly where a valid match may start and end.
The move: make the match boundary explicit. A regex without anchors often answers a different question than the one you meant. It answers "can I find this pattern somewhere?" not "is this whole value valid?" That distinction is the source of many false positives. Think in contracts. A validation contract needs a start, an allowed body, and an end. A search contract may need word boundaries so a token does not hide inside a larger word. A line-processing contract may need multiline behavior, where ^ and $ apply per line instead of only to the whole string. The key mechanism…
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