Android Question Return only numbers and letters from string

aaronk · Feb 6, 2017

Hi,

If I have a string, how can you return only numbers and letters only ?

For Example:

B4X:

Dim MyString as string = "ABC.1>234?"
' how can I make it only return ACB1234 only ?

I know I can use:

B4X:

MyString = MyString.Replace(".","")

However, I was hoping not to use the 'replace' function.

Is there a way to make a string only contain letters and numbers only ?

Erel · Feb 6, 2017

B4X:

Sub OnlyNumbersOrLetters (s As String) As String
   Dim m As Matcher = Regex.Matcher("[a-zA-Z0-9]+", s)
   Dim sb As StringBuilder
   sb.Initialize
   Do While m.Find
     sb.Append(m.Match)
   Loop
   Return sb.ToString
End Sub

sorex · Feb 6, 2017

or

B4X:

Dim MyString As String = "ABC.1>234?"
Log( Regex.Replace("[^a-zA-Z0-9]",MyString,"") )

Android Question Return only numbers and letters from string

aaronk

Well-Known Member

Erel

B4X founder

sorex

Expert

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Android Question Return only numbers and letters from string

aaronk

Well-Known Member

Erel

B4X founder

sorex

Expert

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