Regex excluding all numbers - regex

Question

Hello I'm trying to search all the matching expressions in a file through a Regex in VB.NET
I have the function:
Dim written As MatchCollection = Regex.Matches(ToTreat, "\bGlobalIndexImage = \'(?![0-9])([A-Za-z])\w+\'")
For Each writ As Match In written
For Each w As Capture In writ.Captures
MsgBox(w.Value.ToString)
Next
Next
I have this Regex now:
\bGlobalIndexImage = \'(?![0-9])([A-Za-z])\w+\'
I'm trying to match all occurrences under this form:
GlobalIndexImage = 'images'
GlobalIndexImage = 'Search'
But I also get values like this which I don't want to match:
GlobalIndexImage = 'Z0003_S16G2'
So I wanted in my Regex to simply exclude a match if it contains numbers.

Answer 1

The \w shorthand character class matches letters and digits and _. If you need only letters, just use [a-zA-Z]:
"\bGlobalIndexImage = '([A-Za-z]+)'"
See the regex demo.
Details:
\b - a leading word boundary
GlobalIndexImage = ' - a string of literal chars
([A-Za-z]+) - Group 1 capturing one or more (due to + quantifier) ASCII letters
' - a single quote.
If you need to match any Unicode letters, replace [a-zA-Z] with \p{L}.
VB.NET:
Dim text = "GlobalIndexImage = 'images' GlobalIndexImage = 'Search'"
Dim pattern As String = "\bGlobalIndexImage = '([A-Za-z]+)'"
Dim matches As List(Of String) = Regex.Matches(text, pattern) _
.Cast(Of Match)() _
.Select(Function(m) m.Groups(1).Value) _
.ToList()
Console.WriteLine(String.Join(vbLf, matches))
Output:

Answer 2

To catch everything that's not a number use \D
So your regex will be something like
\bGlobalIndexImage = \'\d+\'
But this will also include words with white spaces. To get only letters use [a-zA-Z]
\bGlobalIndexImage = \'[a-zA-Z]+\'