在PHP中模式是什么意思：
'#^/abc/(?P<abc>[^/]++)$#si'; // please expand this pattern's meaning.
哪些字符串可以与此模式匹配preg_match_all？
这种模式'#^/abc/(?P<abc>[^/]++)$#si';分解如下：
/^\/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-确保您/在站点上转义，因为它假定/是php分隔符。在您的模式示例中，#是分隔符，然后将其包装在引号和字符串终止符;。实际的表达式只是^/abc/(?P<abc>[^/]++)$使用单行和不区分大小写的修饰符。）
还要注意两个++符号的使用，这会将行为从贪婪变为占有欲。
匹配的字符串示例：
/abc/somethingelsenotafrontslash
您可以阅读有关以下内容的简要说明： preg_match_all here
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