#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "(?im)^(.*?)\s+[^\s]*\s+\d.*?Datum:\s*([\d\.]+)"
Local $sString = "Max Muster Musterstraße 22B 11111 Musterhausen Fon: 04321 / 123456 Fax: 04321 / 23356 vertrieb@muster-text.de www.muster-text.de Kunden-Nr.: 023456 USt-IdNr.: DE111111111 Bestell-Nr.: 343213 Datum: 13.12.2021" & @CRLF & _
"" & @CRLF & _
"Firma Musterhausen Musterallee 1a 11111 Musterhausen Fon: 04321 / 123456 Fax: 04321 / 23356 vertrieb@muster-text.de www.muster-text.de Kunden-Nr.: 023456 USt-IdNr.: DE111111111 Bestell-Nr.: 343213 Datum: 13.12.2021" & @CRLF & _
"" & @CRLF & _
"Sonja Musterfrau-Doppelhans Musterallee 1a 11111 Musterhausen Fon: 04321 / 123456 Fax: 04321 / 23356 vertrieb@muster-text.de www.muster-text.de Kunden-Nr.: 023456 USt-IdNr.: DE111111111 Bestell-Nr.: 343213 Datum: 13.12.2021" & @CRLF & _
"" & @CRLF & _
"Peter Muster-Whatever-Blablub Musterallee 1a 11111 Musterhausen Fon: 04321 / 123456 Fax: 04321 / 23356 vertrieb@muster-text.de www.muster-text.de Kunden-Nr.: 023456 USt-IdNr.: DE111111111 Bestell-Nr.: 343213 Datum: 13.12.2021"
Local $aArray = StringRegExp($sString, $sRegex, $STR_REGEXPARRAYGLOBALFULLMATCH)
Local $aFullArray[0]
For $i = 0 To UBound($aArray) -1
_ArrayConcatenate($aFullArray, $aArray[$i])
Next
$aArray = $aFullArray
; Present the entire match result
_ArrayDisplay($aArray, "Result")
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm