#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "(?mi)^((^\+44)|^(4{2})|(^0{2}4{2})|(^0)|)([123789])\d{8,9}$"
Local $sString = "+44123456789" & @CRLF & _
"+441234567890" & @CRLF & _
"+44123456789" & @CRLF & _
"+441234567890" & @CRLF & _
"+447921040642" & @CRLF & _
"+441234567890" & @CRLF & _
"+44123456789" & @CRLF & _
"+44123456789" & @CRLF & _
"+441234567890" & @CRLF & _
"+44123456789" & @CRLF & _
"441234567890" & @CRLF & _
"44123456789" & @CRLF & _
"441234567890" & @CRLF & _
"447921040642" & @CRLF & _
"441234567890" & @CRLF & _
"44123456789" & @CRLF & _
"44123456789" & @CRLF & _
"441234567890" & @CRLF & _
"07921040642" & @CRLF & _
"0123456789" & @CRLF & _
"01234567890" & @CRLF & _
"0123456789" & @CRLF & _
"01234567890" & @CRLF & _
"01932867083" & @CRLF & _
"00441234567" & @CRLF & _
"0845121212" & @CRLF & _
"0044123456789" & @CRLF & _
"00441234567890" & @CRLF & _
"0123456789" & @CRLF & _
"01234567890" & @CRLF & _
"0123456789" & @CRLF & _
"01234567890" & @CRLF & _
"01932867083" & @CRLF & _
"00441234567" & @CRLF & _
"0044123456789" & @CRLF & _
"00441234567890" & @CRLF & _
"0044123456789" & @CRLF & _
"00441234567890" & @CRLF & _
"08006444454" & @CRLF & _
"4451925858" & @CRLF & _
"01420383091 " & @CRLF & _
"112222222" & @CRLF & _
"111111111"
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