正则表达式:在数字后跟字母时添加空格 [英] Regex: Add space after a number when followed by letter

问题描述

在一组数字之后，我想在字符串中添加一个空格.例如，以下字符串应在数字后添加一个空格:

Following a set of numbers I would like to add a space to the string. For instance, the following strings should add a space after a number:

Before                           After
"0ABCD TECHNOLOGIES SERVICES"    "0 ABCD TECHNOLOGIES SERVICES"
"ABCD0 TECHNOLOGIES SERVICES"    "ABCD 0 TECHNOLOGIES SERVICES"

"ABCD 0TECHNOLOGIES SERVICES"    "ABCD 0 TECHNOLOGIES SERVICES"
"ABCD TECHNOLOGIES0 SERVICES"    "ABCD TECHNOLOGIES 0 SERVICES"

"ABCD TECHNOLOGIES 0SERVICES"    "ABCD TECHNOLOGIES 0 SERVICES"
"ABCD TECHNOLOGIES SERVICES0"    "ABCD TECHNOLOGIES SERVICES 0"

我一直试图通过以下方式在Python中处理正则表达式:

I have been trying to work on regex in Python as in the following way:

text= re.sub(r'([0-9]+)?([A-Za-z]+)?([0-9]+)?',
                 r'\1 \2 \3',
                 text,
                 0,
                 re.IGNORECASE)

在前面的代码中，我得到了不想要的空间，这些空间在影响其他正则表达式转换:

With the previous code I am getting undesired spaces which are affecting other regex transformation:

"0 abcd     technologies     services   "

如何在不添加不需要的空格的情况下在字符串中增加空格?

How can I get the addition of space in the string without adding undesired spaces?

感谢您的指导:)

推荐答案

您可以使用

re.sub(r'(?<=\d)(?=[^\d\s])|(?<=[^\d\s])(?=\d)', ' ', text)

请参见 regex演示.

模式详细信息

• (?<=\d)(?=[^\d\s])-数字与字符之间的位置，而不是数字和空格
• |-或
• (?<=[^\d\s])(?=\d)-除数字和空格与数字之间的字符之间的位置.

• (?<=\d)(?=[^\d\s]) - a location between a digit and a char other than a digit and whitespace
• | - or
• (?<=[^\d\s])(?=\d) - a location between a char other than a digit and whitespace and a digit.

Python测试:

import re
tests = ['0ABCD TECHNOLOGIES SERVICES',
'ABCD0 TECHNOLOGIES SERVICES',
'ABCD 0TECHNOLOGIES SERVICES',
'ABCD TECHNOLOGIES0 SERVICES',
'ABCD TECHNOLOGIES 0SERVICES',
'ABCD TECHNOLOGIES SERVICES0']

rx = re.compile(r'(?<=\d)(?=[^\d\s])|(?<=[^\d\s])(?=\d)')

for test in tests:
    print(rx.sub(' ', test))

输出:

0 ABCD TECHNOLOGIES SERVICES
ABCD 0 TECHNOLOGIES SERVICES
ABCD 0 TECHNOLOGIES SERVICES
ABCD TECHNOLOGIES 0 SERVICES
ABCD TECHNOLOGIES 0 SERVICES
ABCD TECHNOLOGIES SERVICES 0

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