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comparing Strings

Posted on 2006-10-24
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Last Modified: 2012-05-05
Hello All,
I need some help on where to start to compare ONE string to an array of strings and create ANOTHER ARRAY of matching strings following strings  they are both formated with a semicolon as a seperator BUT i want to compare the second string.  Here is an example
BTW they will be read in from an ascii file

String to use as what i want to compare everything against
on a note i won't know any comparison words.  Like for this example i wouldn't be able to put in wooden or door

WODOOR;wooden door

example of the different strings
10 02 01 ; solid wood door
10 03 04 ; hollow wood door
10 03 04 ; wooden laminent slider
10 25 04 ; window casement  <-- this should fail

I would want it to find the FIRST THREE examle BUT NOT THE LAST

Is their any hope??

Thanks
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Question by:sherrick123
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LVL 64

Expert Comment

by:Fernando Soto
ID: 17798314
What version of .Net, 2003 or 2005?
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Author Comment

by:sherrick123
ID: 17798612
2005
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LVL 64

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 17798974
Hi sherrick123;

This solution uses Regular Expressions

Imports System.Text.RegularExpressions

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click

        Dim TestData() As String = {"10 02 01 ; solid wood door", _
            "10 03 04 ; hollow wood door", "10 03 04 ; wooden laminent slider", _
            "10 25 04 ; window casement "}
        Dim FindWords As String = "WODOOR;wooden door"
        Dim MyFoundStrings() As String
        MyFoundStrings = DoesStringContain(FindWords, TestData)

    End Sub

    Private Function DoesStringContain(ByVal LookingFor As String, _
        ByVal LookingIn() As String) As String()

        Dim TempArray As New ArrayList

        LookingFor = LookingFor.Substring(LookingFor.IndexOf(";"c) + 1).Trim()
        LookingFor = Regex.Replace(LookingFor, "\s+", "`")
        LookingFor = Regex.Escape(LookingFor).Replace("`"c, "|")
        LookingFor = "\b" & Regex.Replace(LookingFor, "\s+", "|") & "\b"
        For Each str As String In LookingIn
            Dim ParseStr As String = str.Substring(str.IndexOf(";"c) + 1)
            If Regex.IsMatch(ParseStr, LookingFor, RegexOptions.IgnoreCase) Then
                TempArray.Add(str)
            End If
        Next

        Dim FoundStrings(TempArray.Count - 1) As String

        If TempArray.Count > 0 Then TempArray.CopyTo(FoundStrings)

        Return FoundStrings

    End Function
End Class


Fernando
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Author Comment

by:sherrick123
ID: 17799162
Thanks Fernando
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Author Comment

by:sherrick123
ID: 17799183
Question though what do the switches mean like the \b \s ??
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LVL 64

Expert Comment

by:Fernando Soto
ID: 17799198
They are Regular Expression meta-characters. The \b means that the next character start on a word boundary and the \s means a white space character.
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