擅长:python、mysql、java
<p><code>re.search()</code>解决方案:</p>
<pre><code>import re
def contains(s):
return not re.search(r'[^a-zA-Z0-9. ]', s)
print(contains('hello223 3423.')) # True
print(contains('0you and me = ')) # False
print(contains('.hellohow1')) # True
</code></pre>