RegExp Writing

Basically what its doing is its looking for anyname with .xlsx or .docx

() --> Groups multiple tokens together and creates a capture group for extracting a substring or using a backreference.

(.) -->Matches any character except line breaks + -->Matches 1 or more of the preceding token. | -->Acts like a boolean OR. Matches the expression before or after the |

If this helped , please mark as correct answer !

Thank You Murali