正则表达式 Python：负前瞻删除/保留开头的数字

Question

目的是将基数和序数保留在字符串的开头，只要它们紧接在单词PERFORMANCE或SCORE ：

#These numbers are kept:
100 SCORE FOR STUDENT
80 PERFORMANCE FOR TEACHER

但是，如果数字在开头且后面的单词不同，则应将其删除：

#These numbers are removed
10095TH 10097TH 179TH SCHOOL ANIVERSARY
11 12 10 SECONDARY LEVELS
100 100 100 100 SCHOOL AGREEMENT

我遇到的问题是在单词PERFORMANCE或SCORE有由空格分隔的数字：

#All numbers should be kept
3 10 100 PERFORMANCE
001 10 12345 SCORE

我正在应用以下正则表达式，但最后一部分很乱(?!\\s*\\d*\\s*\\d*\\s*(?:PERFORMANCE|SCORE)\\b)因为目前这只是考虑 3 组要保留PERFORMANCE或SCORE之前的数字：

(?<=[A-Za-z]\b )([ 0-9]*(ST|[RN]D|TH)?\b)|^(([\d ]+(ST|[RN]D|TH)?)*\b)(?!\s*\d*\s*\d*\s*(?:PERFORMANCE|SCORE)\b)

以前的正则表达式适用于以下情况：

3 10 100 PERFORMANCE
001 10 12345 SCORE

但如果我添加一组额外的数字，它将不起作用：

3 10 100 1 PERFORMANCE
001 10 1 12345 SCORE

如何概括此规则以包含所有数字集？

谢谢

Answer 1

请尝试以下操作：

^(?:\d+(?:ST|[RN]D|TH)?\s)+(?=[^\d]+$)(?!PERFORMANCE|SCORE)

^                       anchor to beginning
(?:                     start non-capturing group
    \d+                 match one or more digits
    (?:ST|[RN]D|TH)?    optionally followed by one of your approved suffixes
    \s                  then a whitespace
)+                      one or more times
(?=[^\d]+$              assert that the rest of the line is number-free (forces the regex to not backtrack to the last number)
(?!PERFORMANCE|SCORE)   assert that the following characters are NOT 'PERFORMANCE' or 'SCORE'