Using Regular Expressions

System.Text.RegularExpressions Overview 

first you need to import the library for that write following code 

Imports System.Text.RegularExpressions 

at the start of your source code.

    Sub CheckProgram()

        'The regex pattern "\d+" matches one or more digit characters together

        Dim RegularExpression As Regex = New Regex("\d+")

        Dim match As Match = RegularExpression.Match("Dot 55 Perls")

        If match.Success Then

            'If the match is successful, we print its value, which is "55".

            Console.WriteLine(match.Value)

        End If

    End Sub

 these is sample example of regular expression.