import re
s = "17.02.09 10:42:31.242 TRACE [1245] GDS:     someText(SomeText).ClientID: '' -> '99071901'"
regex = r"^([\d.]+)\s+([\d.:]+)\s+(TRACE)\s+\[(\d+)] GDS:.*?ClientID:\s*''\s*->\s*'(\d+)'$"
m = re.search(regex, s)
if m:
	print(m.group(1))
	print(m.group(2))
	print(m.group(3))
	print(m.group(4))
	print(m.group(5))