python - How to preserve case using re.IGNORECASE and .sub? -

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import re  def bold_partial(long_string, partial):      replacer = re.compile(partial, re.ignorecase)     new_long_string = replacer.sub('<b>' + partial + '</b>', long_string)     print new_long_string   bold_partial('my name roger shrubber. arrange, design, , sell shrubberies.', 'roger shrubber')

returns:
name roger shrubber. arrange, design, , sell shrubberies.

i'd return original case:

my name roger shrubber. arrange, design, , sell shrubberies.

sorry, i'm total noob. appreciated. 

def bold_partial_rep(matchobj):     return '<b>' + matchobj.group(0) + '</b>'  def bold_partial(long_string, partial):     replacer = re.compile(partial, re.ignorecase)     new_long_string = replacer.sub(bold_partial_rep, long_string)     print new_long_string

or if want shorten code can rid of new function , use following line in bold_partial():

new_long_string = replacer.sub(lambda m: '<b>%s</b>' % m.group(0), long_string)

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