by Brian Battles WS1O (15 Submissions)
Category: String Manipulation
Compatability: Visual Basic 3.0
Difficulty: Beginner
Date Added: Wed 3rd February 2021
Rating: 
(3 Votes)
Extracts the contents of a "child" substring from a "parent" string between 2 additional specified substrings.
For example, if you called it like this:
GetStringBetween("Fourscore and seven years ago, our fathers", " and ", " our ")
It will return
"seven years ago,"
Inputs
"parent" string, string to begin after, optional string to end before, optional case sensitive flag
Assumes
Pass this function a string (strCompleteString), and it will return a substring consisting of everything between 2 other specified strings (ie, everything between strFirst and strLast)
You can also optionally specify if it should be case sensitive (default is False)
Example: GetStringBetween("Fourscore and seven years ago, our fathers", "and", "our") would return "seven years ago,"
Bonus: if you leave out the last string, you'll just get the word following the first word
Example: GetStringBetween("Fourscore and seven years ago, our fathers", "and") would return "seven"
Code Returns
String
Side Effects
Not really a "side effect," more of a "bonus," if you pass in a space " " as the end string, you just get back the one full word after the first string
VBcodersPublic Function GetStringBetween(strCompleteString As String, strFirst As String, Optional strLast As String, Optional bCaseSensitive As Boolean = False) As String
' Purpose : Pass this function a string (strCompleteString),
' and it will return a substring consisting of
' everything between 2 other specified strings
' (ie, everything between strFirst and strLast)
' You can also optionally specify if it should be case sensitive (default is False)
' Bonus: if you leave out the last string, you'll
' just get the word following the first word
' Or if you leave off the first string, it will start from the
' first character in the main string
' Example : GetStringBetween("Fourscore and seven years ago, our fathers", "and", "our")
' would return "seven years ago,"
' Parameters: strCompleteString, strFirst, strLast, bCaseSensitive
' Returns : String
' Modified : 3/30/2002 By BB
Dim iPos As Integer
Dim iLen As Integer
Dim strTemp1 As String
Dim strTemp2 As String
On Error GoTo Err_GetStringBetween
' make sure we have valid values to work with
If Len(strCompleteString) = 0 Then
' no string to parse
MsgBox "Missing Main String, Nothing to Parse", vbInformation, "Advisory"
strTemp2 = ""
GoTo Exit_GetStringBetween
ElseIf Len(strFirst) = 0 Then
' no beginning string, so begin at first character
iPos = 1
ElseIf Len(strLast) = 0 Then
' no ending string, so we'll make it a space
strLast = " "
End If
' if no beginning was specified, we can skip this
If iPos < 1 Then
' get the location in the string where our first string occurs
If bCaseSensitive Then
' case sensitive
iPos = InStr(1, strCompleteString, strFirst, vbBinaryCompare)
Else
' case insensitive
iPos = InStr(1, strCompleteString, strFirst, vbTextCompare) ' default
End If
End If
' assuming we did find the first string...
If iPos > 0 Then
' extract everything to the right of the first string;
' we use the expression
' Len(strCompleteString) - (iPos + Len(Trim$(strFirst)
' to determine where the first string actually ends,
' the Trim$ call makes sure we don't include any spaces the user may have passed in
' (you have to pass in the spaces around a word to distinguish a complete word
' from a string that may appear within a word, eg, the "and" in "thousand" would
' mess us up if we had called it like this:
' GetStringBetween("Four thousand and seven years ago", "and", "ago")
' so the right way to call it would be this:
' GetStringBetween("Four thousand and seven years ago", " and ", "ago")
'
' I hope that makes it clear!
If iPos = 1 Then
strTemp1 = Trim$(Right$(strCompleteString, Len(strCompleteString)))
Else
strTemp1 = Trim$(Right$(strCompleteString, Len(strCompleteString) - (iPos + Len(Trim$(strFirst)))))
End If
End If
If (LCase$(strFirst) = " inner join ") And (LCase$(strLast) = " on ") Then
iLen = Len(strTemp1)
If bCaseSensitive Then
' case sensitive
iPos = InStrRev(strTemp1, strLast, iLen, vbBinaryCompare)
Else
' case insensitive
iPos = InStrRev(strTemp1, strLast, iLen, vbTextCompare) ' default
End If
If iPos > 0 Then
strTemp2 = " INNER JOIN " & Trim$(Left$(strTemp1, iPos - 1)) & " ON "
Else
strTemp2 = strTemp1
End If
Else
If bCaseSensitive Then
' case sensitive
iPos = InStr(1, strTemp1, strLast, vbBinaryCompare)
Else
' case insensitive
iPos = InStr(1, strTemp1, strLast, vbTextCompare) ' default
End If
If iPos > 0 Then
strTemp2 = Trim$(Left$(strTemp1, iPos - 1))
Else
strTemp2 = strTemp1
End If
End If
Exit_GetStringBetween:
On Error Resume Next
GetStringBetween = strTemp2
On Error GoTo 0
Exit Function
Err_GetStringBetween:
Select Case Err
Case 0
Resume Next
Case Else
MsgBox "Error Code: " & Err.Number & vbCrLf & vbCrLf & Err.Description & vbCrLf & vbCrLf & "In modBuildSQL, during GetStringBetween" & vbCrLf & vbCrLf & Err.Source, vbInformation, App.Title & " ADVISORY"
strTemp2 = ""
Resume Exit_GetStringBetween
End Select
End Function
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