Find the length of function names

Not sure what you're trying to achieve, but why not write a script that goes through a projects' header files and searches for any line that has "(" and just analyze that way (simple string search and trim). Scripts should offer easier ways to search through files and look through strings, hence the recommendation.

If you want to do it C (instead of script), use something like this[^] to find the special character (the '('), from that location, move backwards to find the first blank space.

If you need more help, post a more clear/concise/specific question. This is a little broad.

Use the Visual Studio MACRO(Script) Editor:
I suggest you look at the VS Macros Tool and write a small macro script to parse through the file for you. The main object you will be interested in is one called Microsoft.VisualStudio.VCCodeModel. This will allow you to use the Visual Studio IDE to parse the code and find all of the function names, then test them with a simple MACRO in the VS IDE:

I can't say this is 100% correct, but it will get you close to what you need:

When you are done, you can map the Macro TestFunctionNameLength to a keyboard command, or run the macro through the Macro Explorer in Visual Studio.

Imports System
Imports EnvDTE
Imports EnvDTE80
Imports EnvDTE90
Imports VSLangProj2
Imports VSLangProj90
Imports System.Diagnostics
Imports System.Collections.Generic
Imports Microsoft.VisualStudio.VCCodeModel
Imports System.Text

    '*************************************************************************
    'DESCRIPTION: Tests all of the functions in the current file for proper len.
    '
    Sub TestFunctionNameLength()
        ' Walk all of the elements for the file and test with the helper delegate.
        WalkFileCodeElements(AddressOf TestFnNameLenCallBack_)

    End Sub
    '*************************************************************************
    'DESCRIPTION: A worker function to test the length of a function name.
    '
    Sub TestFnNameLenCallBack_(ByRef elt As VCCodeElement)
        ' Only process if the input element is a function.
        If (elt.Kind() = vsCMElement.vsCMElementFunction) Then
            If (elt.Name.Length > 32) Then
              '
              ' ADD SCOLDING OF THE DEVELOPER OF THIS FUNCTION HERE!
              '
            End If
        End If
    End Sub

    '*************************************************************************
    Public Delegate Sub CodeElementDelegateCallBack(ByRef elt As VCCodeElement)

    '*************************************************************************
    ' DESCRIPTION: Walks all of the code elements in the specified collection
    '              and uses each element in a call to the callback delegate 
    '              passed into the function.
    '
    Sub WalkElementCodeElements(ByVal elts As VCCodeElements, _
                                ByVal callback As CodeElementDelegateCallBack)
        For Each elt As VCCodeElement In elts
            callback(elt)
        Next

    End Sub

    '*************************************************************************
    Sub WalkFileCodeElements(ByVal callback As CodeElementDelegateCallBack)
        ' First try to get the code model for the current file.
        Dim vcCm As VCCodeModel
        Try
            vcCm = DTE.ActiveDocument.ProjectItem.FileCodeModel
        Catch ex As Exception

        End Try

        ' That did not work.  The file is probably not part of the project.
        ' Attempt to use the active projects code model.
        If (vcCm Is Nothing) Then
            Dim dte2 As EnvDTE80.DTE2 = DTE
            Dim e As EnvDTE.Properties = dte2.Solution.Properties

            Dim project As Project = dte2.Solution.Projects.Item(1)

            vcCm = project.CodeModel

            ' Validate these results.  If they failed, drop out.
            If (vcCm Is Nothing) Then
                Return
            End If
        End If

        WalkElementCodeElements(vcCm.CodeElements, callback)
    End Sub

[Edit: Changed the name of the function call from Sub RemoveFunctionComments(), to TestFunctionNameLength(). This sample was a quick adaptation from a macro I wrote to strip the comments from a function definition.]