Question

how to check particular value start with string or digit. here i attached my code. am getting error to like idendifier expected.

code
----
 Dim i As String
 dim ReturnValue  as boolean
    i = 400087
    Dim s_str As String = i.Substring(0, 1)

   Dim regex As Regex = New Regex([(a - z)(A-Z)])
    ReturnValue = Regex.IsMatch(s_str, Regex)




error 

regx is type and cant be used as an expression

Answer 1

Your variable is regex, Regex is the type of the variable.

So it is:

ReturnValue = Regex.IsMatch(s_str, regex)

But your regex is also flawed. [(a - z)(A-Z)] is creating a character class that does exactly match the characters ()-az, the range A-Z and a space and nothing else.

It looks to me as if you want to match letters. For that just use \p{L} that is a Unicode property that would match any character that is a letter in any language.

Dim regex As Regex = New Regex("[\p{L}\d]")