sre_constants.error: nothing to repeat at position 0

Question

当我运行我的代码使用 Python 3.5.1:

时，我收到一条错误消息

sre_constants.error: nothing to repeat at position 0

我在我的代码中找不到错误，我认为错误甚至不在我的代码中。

这是我的代码：

import re

numberRegexa = re.compile(r'06\d{8}')
numberRegexb = re.compile(r'06 \d{8}')
numberRegexc = re.compile(r'31 6 \d{8}')
numberRegexd = re.compile(r'+31 6 \d{8}')
numberRegexe = re.compile(r'316\d{8}')
numberRegexf = re.compile(r'+316\d{8}')
numberRegexg = re.compile(r'316 \d{8}')
numberRegexh = re.compile(r'+316 \d{8}')
numberRegexi = re.compile(r'31 6\d{8}')
numberRegexj = re.compile(r'+31 6\d{8}')

##numberRegexAll = [
##    (1,  numberRegex06a),
##    (2,  numberRegex06b),
##    (3,  numberRegex31a),
##    (4,  numberRegex31b),
##    (5,  numberRegex31c),
##    (6,  numberRegex31d),
##    (7,  numberRegex31e),
##    (8,  numberRegex31f),
##    (9,  numberRegex31g),
##    (10, numberRegex31h),
##]

def searchNumber():
    result = numberRegex06a.search(userInput)
    print('Found: ' + result.group())

userInput = input("Insert text you'd like searched:\n")
searchNumber()

这是我的日志：

Traceback (most recent call last):   File "C:/Users/Hibuna/Desktop/asdsad.py", line 6, in <module>
    numberRegexd = re.compile(r'+31 6 \d{8}')

  File "C:\Programs\Python 3.5.1\lib\re.py", line 224, in compile
    return _compile(pattern, flags)

  File "C:\Programs\Python 3.5.1\lib\re.py", line 293, in _compile
    p = sre_compile.compile(pattern, flags)

  File "C:\Programs\Python 3.5.1\lib\sre_compile.py", line 536, in compile
    p = sre_parse.parse(p, flags)

  File "C:\Programs\Python 3.5.1\lib\sre_parse.py", line 829, in parse
    p = _parse_sub(source, pattern, 0)

  File "C:\Programs\Python 3.5.1\lib\sre_parse.py", line 437, in
_parse_sub
    itemsappend(_parse(source, state))

  File "C:\Programs\Python 3.5.1\lib\sre_parse.py", line 638, in
_parse
    source.tell() - here + len(this))

这是怎么回事？

Answer 1

您可以在此处测试您的正则表达式模式：https://regex101.com/r/eY4aT8/1。对它们进行了详细解释并描述了错误。

问题在于您的正则表达式模式 +31 6 \d{8} - 它不能仅以 + 开头而 + 左侧没有任何内容。

sre_constants.error: nothing to repeat at position 0

sre_constants.error: nothing to repeat at position 0

python

python-3.x

python-3.5