blocks|key|3938925|text|在这里，我们可以找到一个简单的带有捕获组的表达式，如果我们喜欢，类似于：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3938926|%5E(\[.%2B\])$|code-block|syntax|javascript|3938927|测试|3938928|#+coding=utf8
#+the+above+tag+defines+encoding+for+this+document+and+is+for+Python+2.x+compatibility

import+re

regex+=+r"%5E(\[.%2B\])$"

test_str+=+("[+and+ends+with+]\n"
++++"+[+and+ends+with+]")

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+%2B+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.|3938929|DEMO|offset|length|3938930|RegEx|3938931|如果这个表达式不需要，可以在regex101.com中修改/更改。|3938932|RegEx电路|3938933|jex.im可视化正则表达式：|3938934|​|3938935|📷|atomic|3938936|3938937|entityMap|0|LINK|mutability|MUTABLE|url|https://regex101.com/r/1Z02qx/1/|1|2|https://jex.im/regulex/#!flags=&re=%5E(a%7Cb)*?$|3|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/9438b2af15e1b2f800483d2d82c105b9.png|imageAlt^0|0|0|0|0|0|4|0|0|0|E|C|1|0|0|0|6|2|0|0|0|1|3|0|0^^$0|@$1|2|3|4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1K|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1L|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|1M|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1N|8|@]|9|@$M|1O|N|1P|1|1Q]]|A|$]]|$1|O|3|P|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1S|8|@]|9|@$M|1T|N|1U|1|1V]]|A|$]]|$1|S|3|T|5|6|7|1W|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1X|8|@]|9|@$M|1Y|N|1Z|1|20]]|A|$]]|$1|W|3|X|5|6|7|21|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|10|7|22|8|@]|9|@$M|23|N|24|1|25]]|A|$]]|$1|11|3|X|5|6|7|26|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|27|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]|1A|$5|15|16|17|A|$18|19]]|1B|$5|15|16|17|A|$18|1C]]|1D|$5|1E|16|1F|A|$1G|1H|1I|-4]]]]

<p>Here, we can find a simple expression with a capturing group, if we like, something similar to: </p>

<pre><code>^(\[.+\])$
</code></pre>

<h3>Test</h3>

<pre><code># coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility

import re

regex = r"^(\[.+\])$"

test_str = ("[ and ends with ]\n"
    " [ and ends with ]")

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>

<h3><a href="https://regex101.com/r/1Z02qx/1/" rel="nofollow noreferrer">DEMO</a></h3>

<h3>RegEx</h3>

<p>If this expression wasn't desired, it can be modified/changed in <a href="https://regex101.com/r/1Z02qx/1/" rel="nofollow noreferrer">regex101.com</a>.</p>

<h3>RegEx Circuit</h3>

<p><a href="https://jex.im/regulex/#!flags=&amp;re=%5E(a%7Cb)*%3F%24" rel="nofollow noreferrer">jex.im</a> visualizes regular expressions:</p>

<p><a href="https://i.stack.imgur.com/iFJIK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iFJIK.png" alt="enter image description here"></a></p>


<p>I am trying to find the lines that start with [ and ends with ] in a file. I am using regex, but not able to get the result.</p>

<p>I have tried regex with various options, e.g., \s, \S, \w and \W.</p>

<pre class="lang-py prettyprint-override"><code>import re
infile=open("C:\\Users\\Downloads\\Files\\processed.csv","r") 
myregex = re.compile(r'(^\[)(\]$)') 
list=[] 
for groups in myregex.findall(infile.read()):
    item=''.join(groups)
    cleanitem=item.replace('\n','')
    list.append(cleanitem)
print (list)
infile.close()
</code></pre>

<p>It should print all the lines that start with [ and ends with ]. </p>

<p>How do I solve this problem? </p>


RegEx for matching lines starting with [ and ending with ]

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试查找文件中以开头和结尾的行。我正在使用正则表达式，但无法获得结果。我尝试过使用各种选项的正则表达式，例如\s、\S、\W和\w。import reinfile=open("C:\\Users\\Downloads\\Files\\processed.csv","r") myregex = re.compile...

用于匹配以[开头并以]结尾的行的RegEx-腾讯云开发者社区-腾讯云

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