根据文档， re.match 永远不允许在 line 的开头进行搜索:

According to documentation, re.match never allows searching at the beginning of a line:

请注意，即使在 MULTILINE 模式下， re.match()也将仅在字符串的开头而不是每行的开头进行匹配.

Note that even in MULTILINE mode, re.match() will only match at the beginning of the string and not at the beginning of each line.

您需要使用 re.search :

regexString = r"^\s*"+item.feature_key+":"
pq = re.compile(regexString, re.M)
if pq.search(data):

关于原始字符串( r"^ \ s +" )的小注释:在这种情况下，它等效于"\ s +" ，因为没有 \ s 转义序列(例如 \ r 或 \ n )，因此，Python将其视为原始字符串文字.不过，始终使用Python中的原始字符串文字(以及其他语言中的相应符号)来声明正则表达式模式也更安全.

A small note on the raw string (r"^\s+"): in this case, it is equivalent to "\s+" because there is no \s escape sequence (like \r or \n), thus, Python treats it as a raw string literal. Still, it is safer to always declare regex patterns with raw string literals in Python (and with corresponding notations in other languages, too).