#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "(?m)\b\d+(?:,\d+)*"
Local $sString = "this is number 88 and rest of the text" & @CRLF & _
"this is number 2,563 and rest of the text" & @CRLF & _
"" & @CRLF & _
"after I export it into excel. Problem is that I'm using custom tool (not programming language ) that excepts text as an input, regex pattern and export the output. This is why I need single pattern that eliminate space and produce either 88 or 2563 or any other number. The commas are every 3 positions obviously, so it can also be 1,345,321 as well as just single number 5 between "this is number .... and rest of the text""
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