#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "(?m)(?xi)^(" & @CRLF & _
"(AT)?U[0-9]{8} | # Austria" & @CRLF & _
"(BE)?0[0-9]{9} | # Belgium" & @CRLF & _
"(BG)?[0-9]{9,10} | # Bulgaria" & @CRLF & _
"(HR)?[0-9]{11} | # Croatia" & @CRLF & _
"(CY)?[0-9]{8}L | # Cyprus" & @CRLF & _
"(CZ)?[0-9]{8,10} | # Czech Republic" & @CRLF & _
"(DE)?[0-9]{9} | # Germany" & @CRLF & _
"(DK)?[0-9]{8} | # Denmark" & @CRLF & _
"(EE)?[0-9]{9} | # Estonia" & @CRLF & _
"(EL|GR)?[0-9]{9} | # Greece" & @CRLF & _
"ES[A-Z][0-9]{7}(?:[0-9]|[A-Z]) | # Spain" & @CRLF & _
"(FI)?[0-9]{8} | # Finland" & @CRLF & _
"(FR)?[0-9A-Z]{2}[0-9]{9} | # France" & @CRLF & _
"(GB)?([0-9]{9}([0-9]{3})?|[A-Z]{2}[0-9]{3}) | # United Kingdom" & @CRLF & _
"(HU)?[0-9]{8} | # Hungary" & @CRLF & _
"(IE)?[0-9]S[0-9]{5}L | # Ireland" & @CRLF & _
"(IT)?[0-9]{11} | # Italy" & @CRLF & _
"(LT)?([0-9]{9}|[0-9]{12}) | # Lithuania" & @CRLF & _
"(LU)?[0-9]{8} | # Luxembourg" & @CRLF & _
"(LV)?[0-9]{11} | # Latvia" & @CRLF & _
"(MT)?[0-9]{8} | # Malta" & @CRLF & _
"(NL)?[0-9]{9}B[0-9]{2} | # Netherlands" & @CRLF & _
"(PL)?[0-9]{10} | # Poland" & @CRLF & _
"(PT)?[0-9]{9} | # Portugal" & @CRLF & _
"(RO)?[0-9]{2,10} | # Romania" & @CRLF & _
"(SE)?[0-9]{12} | # Sweden" & @CRLF & _
"(SI)?[0-9]{8} | # Slovenia" & @CRLF & _
"(SK)?[0-9]{10} # Slovakia" & @CRLF & _
")$"
Local $sString = "ATU99999999" & @CRLF & _
"BE0999999999" & @CRLF & _
"BG999999999" & @CRLF & _
"HR12345678901" & @CRLF & _
"CY99999999L" & @CRLF & _
"CZ12345678" & @CRLF & _
"DK99999999" & @CRLF & _
"EE123456789" & @CRLF & _
"FI99999999" & @CRLF & _
"FRXX999999999" & @CRLF & _
"DE999999999" & @CRLF & _
"EL123456789" & @CRLF & _
"HU12345678" & @CRLF & _
"IE1S23456L" & @CRLF & _
"IE1234567T" & @CRLF & _
"IE1234567TW" & @CRLF & _
"IE1234567FA" & @CRLF & _
"ESA12345678" & @CRLF & _
"ESZ1234567E"
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