@Avinash Jain you can put any string regular expression using the power of regex.
The regular expression can accept multiple variants, when you use syntax | :
`word1 | word2` , for example. Follow regex manuals https://www.rexegg.com/regex-quickstart.html and others and regex playground - we recommend https://regex101.com/ , where you can check your regular expression.
So the multiplicity is implemented in regex itself.
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