[英]Regex with unknown character length
你們這個簡單的問題。 對不起,我得問一問。
在我的網站上,我想在文本的“隨機”位置使用簽名。 問題是,在此給定的字符串中可能有多個DIFFERENT簽名。
簽名代碼是~~USERNAME~~
所以像
~~timtj~~
~~foobar~~
~~totallylongusername~~
~~I-d0n't-us3-pr0p3r-ch@r@ct3r5~~
我嘗試為此使用preg_match
,但沒有成功。 我知道第三個參數用於存儲匹配項,但是由於格式原因,我無法正確獲取匹配項。
我應該不使用preg_match
,還是不能以這種方式使用簽名?
您可以使用preg_match_all
以及此修改后的regex
preg_match_all('/~~(.*?)~~/', $str, $matches);
<?php
$str="~~I-d0n't-us3-pr0p3r-ch@r@ct3r5~~";
preg_match_all('/~~(.*?)~~/', $str, $matches);
print_r($matches[1]);
OUTPUT :
Array
(
[0] => I-d0n't-us3-pr0p3r-ch@r@ct3r5
)
這應該可以,但是用戶名不能包含~~
preg_match_all('!~~(.*?)~~!', $str, $matches);
輸出:
Array
(
[0] => Array
(
[0] => ~~timtj~~
[1] => ~~foobar~~
[2] => ~~totallylongusername~~
[3] => ~~I-d0n't-us3-pr0p3r-ch@r@ct3r5~~
)
[1] => Array
(
[0] => timtj
[1] => foobar
[2] => totallylongusername
[3] => I-d0n't-us3-pr0p3r-ch@r@ct3r5
)
)
第一個子數組包含完整的匹配字符串,其他子數組包含匹配的組。
您可以使用標志PREG_SET_ORDER
更改順序,請參閱http://php.net/preg_match_all#refsect1-function.preg-match-all-parameters
<?php
$str = "~~timtj~~ ~~foobar~~ ~~totallylongusername~~ ~~I-d0n't-us3-pr0p3r-ch@r@ct3r5~~";
preg_match_all("!~~(.*?)~~!", str, $matches, PREG_SET_ORDER);
print_r($matches);
該代碼產生以下輸出
Array
(
[0] => Array
(
[0] => ~~timtj~~
[1] => timtj
)
[1] => Array
(
[0] => ~~foobar~~
[1] => foobar
)
[2] => Array
(
[0] => ~~totallylongusername~~
[1] => totallylongusername
)
[3] => Array
(
[0] => ~~I-d0n't-us3-pr0p3r-ch@r@ct3r5~~
[1] => I-d0n't-us3-pr0p3r-ch@r@ct3r5
)
)
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