import re

new_float = "[-+]?(\d+(\.\d*)?|\.\d+)([eE][-+]?\d+)?"
old_float = "[-+]?(\d+(\.\d*)?|\d*\.\d+)([eE][-+]?\d+)?"


print re.match('(%s )*' % new_float, '0 0. 0.1 0.1 .1')

print re.match('(%s )*x' % new_float, '0.5 ' * 100)
print re.match('(%s )*x' % old_float, '0.5 ' * 100)