import re

bad_attrs = ['width', 'height', 'style', '[-a-z]*color', 'background[-a-z]*', 'on*']

single_quoted = "'[^']+'"

double_quoted = '"[^"]+"'

non_space = '[^ "\'>]+'

h = re.compile("<" # open

"([^>]+) " # prefix

"(?:%s) *" % ('|'.join(bad_attrs),) + # undesirable attributes

'= *(?:%s|%s|%s)' % (non_space, single_quoted, double_quoted) + # value

"([^>]*)" # postfix

">" # end

, re.I)

if __name__ == "__main__":

html = "<xiaojie xiaojie width='aaa' >"

r = h.sub("acv",html)

print(r)

p = re.compile("\d")

print(p.sub("d","aaa3aaa4aaa543aaa4"))