Android Question Replace characters between two characters in a text file.

Sub RegexReplace(Pattern As String, Text As String, Replacement As String) As String
    Dim m As Matcher
    m = Regex.Matcher(Pattern, Text)
    Dim r As Reflector
    r.Target = m
    Return r.RunMethod2("replaceAll", Replacement, "java.lang.String")
End Sub

    Private str = ".1.|Hello world |00000" As String
    Private i1, i2 As Int
    i1 = str.IndexOf("|")
    i2 = str.IndexOf2("|", i1 + 1)
    str = str.Replace(str.SubString2(i1 + 1, i2), "New text")

Dim s As String =$".1.|Hello world |00000"$
    Dim sarray() As String =Regex.Split("\|",s)  'need to escape with \
    s =s.Replace(sarray(1), "bye bye world")

Sub ReplacePattern(Input As String, Pattern As String, GroupNumber As Int) As String
    Dim sb As StringBuilder
    sb.Initialize
    Dim lastMatchEnd As Int = 0
    Dim m As Matcher = Regex.Matcher(Pattern, Input)
    Do While m.Find
        Dim currentStart As Int = m.GetStart(GroupNumber)
        sb.Append(Input.SubString2(lastMatchEnd, currentStart))
        lastMatchEnd = m.GetEnd(GroupNumber)
        'apply the replacement here:

        Dim val As String = m.Group(GroupNumber)
        For i = val.Length - 1 To 0 Step - 1
            sb.Append(val.CharAt(i))
        Next


    Loop
    If lastMatchEnd < Input.Length Then sb.Append(Input.SubString(lastMatchEnd))
    Return sb.ToString
End Sub

Dim s As String =$".1.|Hello world|asdasd"$
s = ReplacePattern(s, "\|([^|]+)\|", 1)
Log(s)

    Dim List1 As String
    List1 = File.ReadString(File.DirDefaultExternal, "Log.dat")

Dim sarray() As String =Regex.Split("\|",List1)

Dim sarray() As String =Regex.Split("\|([^|]+)\|",List1)