PHP 正则表达式组捕获
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PHP regex groups captures
提问by carlosdubusm
I have the following regex:
我有以下正则表达式：
\[([^ -\]]+)( - ([^ -\]]+))+\]
This match the following successfully:
这成功匹配以下内容：
[abc - def - ghi - jkl]
BUT the match is:
但比赛是：
Array
(
[0] => [abc - def - ghi - jkl]
[1] => abc
[2] => - jkl
[3] => jkl
)
What I need is something like this:
我需要的是这样的：
Array
(
[0] => [abc - def - ghi - jkl]
[1] => abc
[2] => - def
[3] => def
[4] => - ghi
[5] => ghi
[6] => - jkl
[7] => jkl
)
I'm able to do that in C# looking at the groups "captures". How can I do that in PHP?
我可以在 C# 中查看组“捕获”来做到这一点。我怎样才能在 PHP 中做到这一点？
采纳答案by Amadan
This is not the job for the regexp. Match against \[([^\]]*)\], then splitthe first capture by the " - ".
这不是正则表达式的工作。对战\[([^\]]*)\]，split则由第一个捕获" - "。
<?php
$str = "[abc - def - ghi - jkl]";
preg_match('/\[([^\]]*)\]/', $str, $re);
$strs = split(' - ', $re[1]);
print_r($strs);
?>
回答by drudge
Assuming the tokens in your sample string never contain spaces, and are alphanumeric:
假设您的示例字符串中的标记从不包含空格，并且是字母数字：
<?php
$pattern = "/([\w|\d])+/";
$string = "[abc - 123 - def - 456 - ghi - 789 - jkl]";
preg_match_all($pattern, $string, $matches);
print_r($matches[0]);
?>
Output:
输出：
Array
(
[0] => abc
[1] => 123
[2] => def
[3] => 456
[4] => ghi
[5] => 789
[6] => jkl
)
回答by ThorSummoner
SPL preg_match_allwill return regex groups starting on index 1 of the $matchesvariable. If you want to get only the second group you can use $matches[2]for example.
SPL preg_match_all将返回从$matches变量的索引 1 开始的正则表达式组。例如，如果您只想获得第二组，则可以使用$matches[2]。
Syntax:
句法：
$matches = array();
preg_match_all(\
'/(He)\w+ (\w+)/',
"Hello world\n Hello Sunshine",
$matches
);
var_dump($matches);
Result:
结果：
array(3) {
[0] =>
array(2) {
[0] =>
string(11) "Hello world"
[1] =>
string(14) "Hello Sunshine"
}
[1] =>
array(2) {
[0] =>
string(2) "He"
[1] =>
string(2) "He"
}
[2] =>
array(2) {
[0] =>
string(5) "world"
[1] =>
string(8) "Sunshine"
}
}
P.S. This answer is posted for the context of the question title after being directed here by a Google search. This was the information I was interested in when searching for this topic.
PS 在通过 Google 搜索定向到此处后，此答案是针对问题标题的上下文发布的。这是我在搜索此主题时感兴趣的信息。
回答by Andrew
To group your matches, use parenthesize. EG:
要将匹配项分组，请使用括号。例如：
$string = 'bob';
preg_match('/bob/', $string, $matches);
$matcheswill be ['bob']
$matches将会 ['bob']
preg_match('/(b)(o)(b)/', $string, $matches);
$matcheswill be ['bob','b','o','b']
$matches将会 ['bob','b','o','b']
