<p>您的原始表达式工作正常,如果只想提取lat数,我们可能需要稍微修改它:</p>
<pre><code>(?:lat=)([0-9\.\-]+)(?:,)
</code></pre>
<p>其中<code>([0-9\.\-]+)</code>将捕获我们想要的lat,我们将其包装为两个非捕获组:</p>
<pre><code>(?:lat=)
(?:,)
</code></pre>
<a href="https://regex101.com/r/tStNMN/1/" rel="nofollow noreferrer">DEMO</a>
<hr/>
<h3>测试</h3>
<pre><code># coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility
import re
regex = r"(?:lat=)([0-9\.\-]+)(?:,)"
test_str = "Feature(place='28km S of Cliza, Bolivia', long=-65.8913, lat=-17.8571, depth=358.34, mag=6.3) Feature(place='12km SSE of Volcano, Hawaii', long=-155.2005, lat=19.3258333, depth=6.97, mag=5.54)"
matches = re.finditer(regex, test_str, re.MULTILINE)
for matchNum, match in enumerate(matches, start=1):
print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group()))
for groupNum in range(0, len(match.groups())):
groupNum = groupNum + 1
print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum)))
# Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.
</code></pre>