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The Matches Regex action tests a string with a reusable Regular Expression value. It returns true when the pattern finds a match anywhere in the text.

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Inputs

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Outputs

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Match the entire value

Regex matching is not automatically anchored. A pattern of \d+ returns true for Order 1042 shipped because a substring matches. Add anchors when the whole value must follow the pattern:
With that pattern, 1042 matches and Order 1042 does not. Enable the Multiline flag only when ^ and $ should also apply to individual lines.