正则匹配两个特定字符，并获得第一个数字，然后是这些字符

Question

如果用户输入VX为20 m/s VY为40 m/s VZ为60 m/s。

预期结果是来自输入的 Axis VX 和 20。

下面的代码还可以识别其他数字 40 和 40。 60也。

(VX)|(vx)|(Vx)|(vX)|[0-9]

Answer 1

使用

(?P<axis>vx)\s+\w+\s+(?P<value>\d+)

添加re.IGNORECASE。请参阅正则表达式证明。

说明

 - Named Capture Group axis (?P<axis>vx)
   - vx matches the characters vx literally (case insensitive)
 - \s+ matches any whitespace characters between one and unlimited times, as many times as possible, giving back as needed (greedy)
 - \w+ matches any word characters between one and unlimited times, as many times as possible, giving back as needed (greedy)
 - \s+ matches any whitespace characters between one and unlimited times, as many times as possible, giving back as needed (greedy)
 - Named Capture Group value (?P<value>\d+)
   - \d+ matches a digits between one and unlimited times, as many times as possible, giving back as needed (greedy)

Python代码演示：

import re
text = r'VX is 20 m/s VY is 40 m/s  VZ is 60 m/s'
p = re.compile(r'(?P<axis>vx)\s+\w+\s+(?P<value>\d+)', re.IGNORECASE)
match = p.search(text)
if match:
    print(match.groupdict())

结果：{'axis': 'VX', 'value': '20'}