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Executes a search for a match in a specified string.
The exec method syntax has these parts:
Part Description rgexp Required. A Regular Expression object. Can be a variable name or a literal. str Required. The string to perform a search on.
The results of an exec method search are placed into an array.
If the exec method does not find a match, it returns null. If it finds one or more matches, the exec method returns an array, and the RegExp object is updated to reflect the results of the search.
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