var=[[Content-Disposition: attachment; filename="403.htm.en"
Content-Type: text/plain; name='403.htm.en'
Content-Transfer-Encoding: BASE64
]]
filename = string.match(var,"filename=\"(.+)\"")
print("filename = ", filename)
dmFyPVtbQ29udGVudC1EaXNwb3NpdGlvbjogYXR0YWNobWVudDsgZmlsZW5hbWU9IjQwMy5odG0uZW4iCiAgICAgQ29udGVudC1UeXBlOiB0ZXh0L3BsYWluOyBuYW1lPSc0MDMuaHRtLmVuJwogICAgIENvbnRlbnQtVHJhbnNmZXItRW5jb2Rpbmc6IEJBU0U2NAogICAgXV0KZmlsZW5hbWUgPSBzdHJpbmcubWF0Y2godmFyLCJmaWxlbmFtZT1cIiguKylcIiIpCnByaW50KCJmaWxlbmFtZSA9ICIsIGZpbGVuYW1lKQ==