Android Tutorial How you can check enter data is IP or not valid

How you can check enter data is IP or not valid

when user input Ip in textbox, you must check this.
one way is using Regex

for this i have source code. i test it and work true:

Sub ValidateIP(ip As String) As Boolean
    If ip.EqualsIgnoreCase("localhost") Then Return True
    
    Dim pattern As String
    pattern = "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
    
    Dim matcher As Matcher
    matcher = Regex.Matcher(pattern, ip)
    
    Return matcher.Find
End Sub

in pattern :
25[0-5] : it is 3 char then start via 25 and right char only between 0 to 5 (250-251-252-253-254-255)
2[0-4][0-9] : it is 3 char then start with 2 and center char is between 0 to 4 and right char between 0 to 9 (200-201-202-...-243-244-245-...-248-249)
[01]?[0-9][0-9] : it is 0 char to 3 char then first only 0 or 1 and center char is between 0 to 9 and right char is between 0 to 9 (0-1-2-3-...9-10-11-...99-100-101-102-...-199)

Dim userInput As String
userInput = EditText1.Text.Trim 'Ip is not valid

If ValidateIP(userInput) Then
    ToastMessageShow("IP is Valid", True)
Else
    ToastMessageShow("IP is not valid. try again or call Ghaneipour", True)
End If

for local host use this code at first of function: If ip.EqualsIgnoreCase("localhost") Then Return True