Question

我正在通过Al Sweigart在udemy，第29课上自动化无聊的东西课程来学习正则表达式。我收到一条错误消息，说“括号在位置414处不平衡（第12行，第1列）”

该代码用于使用正则表达式提取电话号码和电子邮件地址。

我尝试计算括号并为电子邮件正则表达式取下顶部和底部括号。

#! python3

import re, pyperclip

# Done - TODO: create a regex object for phone numbers
phoneRegex = re.compile(r'''
# Types of number 415-555-0000, 555-0000, (415) 555-0000, 555-0000 ext 12345,
# ext. 12345, x12345
(
((\d\d\d) | (\(\d\d\d\)))?            # area code (optional)
(\s|-)            # first separator
\d\d\d            # first 3 digits
-            # separator
\d\d\d\d            # last 4 digits
((ext(\.)?\s)|x)           # extension word part (optional)
(\d{2,5}))?             # extension number part (optional)
)
''', re.VERBOSE)

# TODO: Create a regex for email addresses
emailRegex = re.compile (r'''
# some.+_thing@(\d{2,5}))?.com

[a-zA-Z0-9_.+]+         # name part - created non default regular   expression class
# to capture any character a-z lowercase, A-Z upper case, numbers 0-9, characters _.+
@        # @ symbol
[a-zA-Z0-9_.+]+        # domain name part

''', re.VERBOSE)

# TODO: Get the text off the clipboard
text = pyperclip.paste()

# TODO: Extract the email/phone from this text
extractedPhone = phoneRegex.findall(text) # creates one string for each group ()
# Make sure desired regex is all in one group ()
extractedEmail = emailRegex.findall(text)

print (extractedPhone)# temporary print function to see if code works
print (extractedEmail)

给出此错误：

回溯（最近通话最近）：第18行，“ C：\ Users * \ Desktop \ Education \ Education \ Computerscience \ automaticing the无聊的东西\ programs \第29课电话和电子邮件regex.py” 在 '''，re.VERBOSE）文件“ C：\ Users * \ AppData \ Local \ Programs \ Python \ Python37 \ lib \ re.py”，行 234，在编译中返回_compile（模式，标志）文件“ C：\ Users * \ AppData \ Local \ Programs \ Python \ Python37 \ lib \ re.py”，行 286，在_compile中 p = sre_compile.compile（模式，标志）文件“ C：\ Users * \ AppData \ Local \ Programs \ Python \ Python37 \ lib \ sre_compile.py”， 764行，正在编译 p = sre_parse.parse（p，标志）文件“ C：\ Users * \ AppData \ Local \ Programs \ Python \ Python37 \ lib \ sre_parse.py”，解析中的第944行提高source.error（“不平衡括号”）重新错误：位置414（第12行，第1列）上的括号不平衡

Answer 1

您需要修复此行(\d{2,5}))? # extension number part (optional)。显然，它需要添加/删除括号。

将该行更改为(\d{2,5})?将解决unbalanced parenthesis错误。

Answer 2

使用RegexFormat 9对此格式进行格式化，它会显示不平衡并且会可能会给您一个解决方法。

     # Types of number 415-555-0000, 555-0000, (415) 555-0000, 555-0000 ext 12345,
     # ext. 12345, x12345
     (                             # (1 start)
          (                             # (2 start), area code (optional)
               ( \d\d\d )                    # (3)
            |  ( \( \d\d\d \) )              # (4)
          )?                            # (2 end)
          ( \s | - )                    # (5), first separator
          \d\d\d                        # first 3 digits
          -                             # separator
          \d\d\d\d                      # last 4 digits
          (                             # (6 start), extension word part (optional)
               (                             # (7 start)
                    ext
                    ( \. )?                       # (8)
                    \s
               )                             # (7 end)
            |  x
          )                             # (6 end)
          ( \d{2,5} )                   # (9), extension number part (optional)
     )?                            # (1 end)
=    )  <-- Unbalanced  ')'

如何纠正正则表达式中的不平衡括号错误？

2 个答案: