#include <StringConstants.au3> ; to declare the Constants of StringRegExp
#include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate
Local $sRegex = "array<struct<(.*?)>>"
Local $sString = "pchase_history:array<struct<pchase_channel:string,trans_dt:string,sku_id:string,sold_qty:bigint>>,first_pchase_dt:string,last_pchase_dt:string,trans_cnt:bigint,last_pchase_sku_cnt:bigint,no_of_pchase_days:bigint,lst_pchase_channel:array<struct<pchase_channel:string>>"
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