import re
s="name=z1hangshan username=fff url=www.baidu.com password=ddd256"
s2="username=fff name=z1hangshan url=www.baidu.com password=ddd256"
#p=re.compile(r'((?:s)name=(S)+)')
p=re.compile(r'(^name=(S)+)')
iter=p.finditer(s)
for m in iter:
 print "m", m.group()
iter2=p.finditer(s2)
for m2 in iter:
 print "m2", m2.group()
#m username=fff
#m2 不匹配