Regular expressions are a programming term that refers to a sequence of characters used to define a search criterion within a given text. Recently, Excel has gained several functions for working with regular expressions, and we can also use them as an argument to the XMATCH function and the XLOOKUP function as an additional search criterion.
The XMATCH function is a more modern version of the MATCH function, and is used to search arrays, by row or column, to find the position of a given value. It supports accurate and approximate comparisons, and wildcard characters can be used as a substitute for one (?) or more characters (*) during search. This is another of the new dynamic array features that is available exclusively to Office 365 subscribers as of February this year.