擅长:python、mysql、java
<pre><code>import re
a = " this is a demonstration sentence. "
print(re.sub(r'''(?x) # VERBOSE mode
( #
^ # start of string
\s* # zero-or-more whitespaces
\w # followed by an alphanumeric character
)
| # OR
(
\w # an alphanumeric character
\S* # zero-or-more non-space characters
\s* # zero-or-more whitespaces
$ # end of string
)
''',
lambda m: m.group().title(),
a))
</code></pre>
<p>收益率</p>
^{2}$