从字符串中提取温度(摄氏度或华氏度) [英] extracting temperature degrees (celcius or fahrenheit) from string

问题描述

我正在使用 (char.*?char2) 来提取以 char1 开头并以 char2 结尾的子部分字符串.

I am using (char.*?char2) in order to extract subparts which starts with char1 and which ends with char2 from a string.

现在我想提取温度信息，例如(40 °C, -30°C, 80°F) 从字符串.在这种情况下，我的正则表达式应该通过考虑 + 和 - 的概率来定义任何数字字符的开头字符，以及以 °C 或 °F，并且中间不能有任何字母，并且数字和结尾之间也应该有 whitespace 字符.

Now I want to extract temperature information e.g. (40 °C, -30°C, 80°F) from a string. In this case my regex expression should define the beginning character with any digit characters by taking into the probability of + and -, and the ending with °C or °F, and there shouldn't be any letter in between, and it should also take whitespace character between the number and ending into possibility.

如何定义这样的正则表达式?

How can I define such a regex?

我已经检查过了，正则表达式提取温度和温度范围从一个字符串，但答案的目标略有不同.

I have checked this, Regex to extract temperatures and temperature ranges from a string, but the answer has slightly a different goal.

推荐答案

(\d+) ?°([CF])

第一组应该有温度，第二组应该是 C 或 F.

The first group should have the temperature, the second C or F.

扩展它以允许更多变化:

Expanding it to allow for a bit more variation:

([+-]?\d+(\.\d+)*)\s?°([CcFf])

这将匹配任何这些输入，允许多个空格或制表符、小写单位, 小数点和符号.

This would match any of these inputs, allowing for more than one space, or tab, lower case unit, decimal points and signs.

示例python程序:

Example python program:

import re
string = '''
20°C
2 °F
It was cold, 2 °F in fact.
30 °C
-40 °C
+2.3^I°c
+2.3°c
10°C
'''
pattern = r'([+-]?\d+(\.\d+)*)\s?°([CcFf])'
print(re.findall(pattern, string))
# Output:
# [('20', '', 'C'), ('2', '', 'F'), ('2', '', 'F'), ('30', '', 'C'),
# ('-40', '', 'C'), ('+2.3', '.3', 'c'), ('+2.3', '.3', 'c'),
# ('10', '', 'C')]

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