我有一個看起來像這樣的字符串：1/ This is a string and it has some text on a new line2/ And then there's another string that has text only on one line532/ Another string that has some year on a new line 2020/xyz followed by some letters720/ This is a match on the same line with another match but the other match won't be captured 721/ And this is the last line \d我想捕獲以小于或等于 3 dgits long( ) 的數字 ( {1,3}) 開頭并具有正斜杠 ( /) 并且位于字符串開頭或前后有空格或換行符的每個字符串( \s+).這就是我希望它看起來像的樣子：[Match 1] 1/ This is a string and it has some text on a new line[Match 2] 2/ And then there's another string that has text only on one line[Match 3] 532/ Another string that has some year on a new line 2020/xyz followed by some letters[Match 4] 720/ This is a match on the same line with another match but the other match won't be captured[Match 5] 721/ And this is the last line 到目前為止，這是我的代碼：$re = '/(\s|^)(?s)\d{1,3}+\/+\s+.*?(?=\d+\/+\s+|$)/m';$str = '1/ This is a string and it has some text on a new line2/ And then there\'s another string that has text only on one line532/ Another string that has some year on a new line2020/xyz followed by some letters721/ And this is the last line ';preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);// Print the entire match resultvar_dump($matches);這是一個演示但是這里有問題：如果兩個匹配項在同一行上，它將不會捕獲字符串（匹配 4 和 5 只會捕獲匹配 4）它不捕獲新行上的字符串它不會捕獲字符串中有數字后跟 / 的部分，例如2020/xyz followed by some letters
2 回答
泛舟湖上清波郎朗
TA貢獻1818條經驗 獲得超3個贊
$將與行尾匹配的錨點（使用 m 修飾符）更改為\z錨點（無論修飾符如何匹配字符串的末尾）。
這樣，不情愿的量詞.*?將能夠匹配多行，而不是停在行的第一端。
要在同一行中查找多個匹配項，請\s+在數字前添加前瞻。否則數字之前的空間不能被消耗兩次（一次被.*?一次被 消耗一次(\s|^)）。
~(\s|^)\d{1,3}/+\s.*?(?=\s+\d{1,3}/+\s|\z)~ms請注意，您可以使用以下方法獲得修剪結果：
~(?<!\S)\d{1,3}/+\s.*?(?=\s+\d{1,3}/+\s|\s*\z)~s要減少步驟數，您可以更改\s.*?并(?>\s+\S+)*?刪除不再需要的 s 修飾符。
呼啦一陣風
TA貢獻1802條經驗 獲得超6個贊
嘗試：
(?:\s|^)\d{1,3}\/\s(?:(?!\s\d{1,3}\/\s)[\s\S])*<?php
$str = "1/ This is a string and it
has some text on a new line
2/ And then there's another string that has text only on one line
532/ Another string that has some year on a new line
2020/xyz followed by some letters
720/ This is a match on the same line with another match but the other match won't be captured 721/ And this is the last line";
preg_match_all('/(?:\s|^)\d{1,3}\/\s(?:(?!\s\d{1,3}\/\s)[\s\S])*/', $str, $matches, PREG_SET_ORDER);
print_r($matches);
印刷：
Array
(
[0] => Array
(
[0] => 1/ This is a string and it
has some text on a new line
)
[1] => Array
(
[0] =>
2/ And then there's another string that has text only on one line
)
[2] => Array
(
[0] =>
532/ Another string that has some year on a new line
2020/xyz followed by some letters
)
[3] => Array
(
[0] =>
720/ This is a match on the same line with another match but the other match won't be captured
)
[4] => Array
(
[0] => 721/ And this is the last line
)
)
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