在 Python 中使用正则表达式获取值

Question

如何仅使用正则表达式获取 test1 的值 4 和 5。我有这个字符串：

  test1 =                 -2,                 2,                 2,                 0,                 0,                 0,                 0,                 0,                 0,                 0
  test2=              27000,             20000,             30000,             16200,              8000,              8000,              8000,              8000,              8000,              8000
  test3 =               1500,              1500,              1500,              1500,              1500,              1500,              1500,              1500,              1500,              1500
  test4 =               7000,              7000,              7000,              8000,              8000,              4000,              4000,              4000,              4000,              4000
  test5 =                500

我有这个命令：

`\s(test)\s*=(?P<test>\D.*)`

它选择了2组，但我想要值4和5。或者有其他方法吗？我不想使用 pandas.

Answer 1

s="""test1 =                 -2,                 2,                 2,                 0,                 0,                 0,                 0,                 0,                 0,                 0
  test2=              27000,             20000,             30000,             16200,              8000,              8000,              8000,              8000,              8000,              8000
  test3 =               1500,              1500,              1500,              1500,              1500,              1500,              1500,              1500,              1500,              1500
  test4 =               7000,              7000,              7000,              8000,              8000,              4000,              4000,              4000,              4000,              4000
  test5 =                500"""

import re

lines = s.splitlines()
g1 = re.findall('[-0-9]+', lines[3])[1:] # test4
g2 = re.findall('[-0-9]+', lines[4])[1:] # test5
print(g1)
print(g2)

输出：

['7000', '7000', '7000', '8000', '8000', '4000', '4000', '4000', '4000', '4000']
['500']

Answer 2

import re

regex = r"test1\s*=\s*-?\d+,\s*-?\d+,\s*-?\d+,\s*(-?\d+),\s*(-?\d+)"

test_str = YOUR_STR

matches = re.finditer(regex, test_str, re.MULTILINE)

for matchNum, match in enumerate(matches):
    matchNum = matchNum + 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)))

如果您正在尝试正则表达式，

regex101.com 是一个有用的工具。该站点还会为您生成代码。

我从那里得到了上面的代码。 https://regex101.com/r/WMUbLf/1

在 Python 中使用正则表达式获取值

Get values using regex in Python

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