PHP爆炸/拆分了2个不同的分隔符 [英] PHP explode/split with 2 different delimiters

问题描述

在下面的字符串$str中，我需要爆炸/分割数据以获取部分'abc'和 first 出现的'::'，然后将其全部内聚在一起细绳.爆炸可以一步完成，而不是连续两次爆炸吗?

In the following string $str I need to explode/split the data get the part 'abc' and the first occurrence of '::' and then implode it all back together to a single string. Can the explode be done in one step instead of two consecutive explodes?

要使用的示例字符串:

$str="12345:hello abcdef123:test,demo::example::12345";

和所需的子字符串

$substr = "abcdef123:test,demo::"

推荐答案

您可以这样做:

preg_match('~\s\Kabc\S+?::~', $str , $match);
$result = $match[0];

或更明确的方式

preg_match('~\s\Kabc\w*+:\w++(?>,\w++)*+::~', $str , $match);
$result = $match[0];

说明:

第一个模式:

~ : delimiter of the pattern
\s : any space or tab or newline (something blank)
\K : forget all that you have matched before
abc : your prefix
\S+? : all chars that are not in \s one or more time (+) without greed (?) 
     : (must not eat the :: after)
~ : ending delimiter

第二种模式:

begin like the first
\w*+ : any chars in [a-zA-Z0-9] zero or more time with greed (*) and the 
     : RE engine don't backtrack when fail (+) 
     : (make the previous quantifier * "possessive")
":"  : like in the string
\w++ : same as previous but one or more time
(?> )*+ : atomic non capturing group (no backtrack inside) zero or more time 
     : with greed and possessive *+ (no backtrack)
"::" : like in the string
~    : ending delimiter 

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