Leading whitespace in dot graph import breaks with strict

[shaolo1]

# This works
def test1():
    dot = '''strict digraph G {
        a -> b
}'''
    graph = AGraph(dot)

# This gives a file not found error
def test2():
    dot = '''
strict digraph G {
    a -> b
}'''
    graph = AGraph(dot)

agraph.py 141 should be
pattern = re.compile(r"(\s*strict)?\s*(graph|digraph).*{.*}\s*", re.DOTALL)