RE_ANYTHING = r".*"
RE_INTEGER = r"\d+"
RE_EPOCHTIME = r"\d+(?:\.\d*)?"
RE_SYSLOGDATE = r"[A-Z][a-z]{2} [ 0-3]?\d \d{2}:\d{2}:\d{2}" # Jan 5 09:38:18
RE_URL = r"http[s]?://[^ \"\'*]+"
RE_MAC = r"[0-9a-fA-F]{2}[:\-\.]?(?:[0-9a-fA-F]{2}[:\-\.]?){4}[0-9a-fA-F]{2}"
RE_IP = r"(?<![.0-9])(?:\d{1,3}.){3}\d{1,3}(?![.0-9])"
RE_EMAIL = r"[a-zA-Z0-9+_\-\.]+@[0-9a-zA-Z][.-0-9a-zA-Z]*.[a-zA-Z]+"
RE_ZULUTIME = r"\d{4}-\d{2}-\d{2}(?: \d{1,2}:\d{2}(?::\d{2}(?:[.]\d{1,5})?)?)?" # 2010-10-01 04:00:00 (ISO 8601 format)