regex error in soup.find_all()?

[Swing]

code:

strPtn = r"jd-details api"

strin = '''
<div class="jd-details api-1">aaaaaa</div>
<div class="jd-details">bbbbbbbbb</div>
<div class="jd-details api-2">ccccccc</div>'''

soup = BeautifulSoup(strin, "html.parser")
all = soup.find_all("div", class_=re.compile(strPtn))
print len(all)

This code will print 0 !
if strPth changed to this:

strPtn = r"jd-details"

output is 3, include all 3 'div', but the middle one is not what I want.

strPtn = r"jd-details api apilevel-\?\?"

This also print 0.

A bug?

[Swing]

I get it....
It's another class!