正則表達式匹配兩個特定字符並獲取第一個數字，然后是那些字符

Question

如果用戶輸入VX 是 20 m/s VY 是 40 m/s VZ 是 60 m/s 。

預期結果是來自輸入的 Axis VX 和 20。

下面的代碼也可以識別其他數字 40 和 60。

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

Answer 1

利用

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

添加re.IGNORECASE 。 請參閱正則表達式證明。

解釋

 - 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 代碼演示：

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())

結果： {'axis': 'VX', 'value': '20'}