PHP中的模式意味着什么：
'#^/abc/(?P<abc>[^/]++)$#si'; // please expand this pattern's meaning.
这个模式与preg_match_all的匹配项是什么？
答案 0 :(得分：5)
这种模式'#^/abc/(?P<abc>[^/]++)$#si';如此分解：
/^\/abc\/(?P<abc>[^\/]++)$/si ^ assert position at start of the string \/ matches the character / literally abc matches the characters abc literally (case insensitive) \/ matches the character / literally (?P<abc>[^\/]++) Named capturing group abc [^\/]++ match a single character not present in the list below Quantifier: Between one and unlimited times, as many times as possible, without giving back [possessive] \/ matches the character / literally $ assert position at end of the string s modifier: single line. Dot matches newline characters i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
（来源：http://regex101.com/r/hS6qE3 - 请确保您在网站上/转义，因为它假设/是php分隔符。在您的模式示例中，#是而是分隔符，然后用引号和字符串终止符;包装。实际表达式只是^/abc/(?P<abc>[^/]++)$，带有单行和不区分大小写的修饰符。）
请注意使用两个++符号，changes the behavior from greedy to possessive。
将匹配的字符串示例：
/abc/somethingelsenotafrontslash
您可以阅读有关preg_match_all here