import re
 
string = """
PIC S9(02)V9(05).    I need this result "02 05"
PIC S9(04).          I need this result "04"
PIC S9(03).          I need this result "03"
PIC S9(03)V9(03).    I need this result "03 03" 
PIC S9(02)V9(03).    I need this result "02 03"
PIC S9(04).          I need this result "04"  
PIC S9(13)V9(03).    I need this result "13 03"
"""
rx = re.compile(
	r"""
	\((\d+)\)		# match digits in parentheses
	[^\n(]+			# match anything not a newline or another opening parenthesis
	(?:\((\d+)\))?	# eventually match another group of digits in parentheses
	""", re.VERBOSE)
 
for match in re.finditer(rx, string):
	if match.group(2):
		m = ' '.join([match.group(1),match.group(2)])
	else:
		m = match.group(1)
	print m
 

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