PHP删除前面的所有字符，最后一个数字除外

我有以下php代码：

$test = "http://cp.dmbshare.net:8000/hls/niehaus/niehaus/1822/1822_1139.ts";

我只想要号码

1139

。但我找不到如何处理preg_替换。 我做了一些图案，但我不能做我想做的

---

有人能帮我吗

把问题分解成更小的部分总是比较容易的

preg_match('/(\d+)\.ts$/', $test, $matches);
echo $matches[1];

您的问题是“查找字符串中的最后一个数字”

我建议将其分为：

查找字符串中的所有数字

拿最后一个

为此，请尝试以下方法：

// match all numeric substrings
preg_match_all("/\d+/",$test,$matches);
// all matches are in $matches[0]
// get last:
$lastnumber = array_pop($matches[0]);

完成了！看看当你把问题分解时，问题是如何变得容易的

解决您的问题的最佳方法如下所示

解释

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这是一个完美的例子，说明如果你试图一次完成所有事情而不是解决问题，事情会变得过于复杂；）@NiettheDarkAbsol:）相信拥有更多。这将是最好的答案+1您还可以通过在前面放置贪心点并使用lookback作为左边框来获取行中的最后一个数字：。

$test = "http://cp.dmbshare.net:8000/hls/niehaus/niehaus/1822/1822_1139.ts";

$test = preg_replace("/(?:.*)((?:\_)([0-9]+))(?:\.[a-z0-9]+)$/","$2",$test);

echo $test; // 1139

(
    ?: Non-capturing group. Groups multiple tokens together without creating a capture group.
    . Dot. Matches any character except line breaks.
    * Star. Match 0 or more of the preceding token.
)
(
    Capturing group #1. Groups multiple tokens together and creates a capture group for extracting a substring or using a backreference.
    (
        ?: Non-capturing group. Groups multiple tokens together without creating a capture group.
        \_ Escaped character. Matches a "_" character (char code 95).
    )
    (
        Capturing group #2. Groups multiple tokens together and creates a capture group for extracting a substring or using a backreference.
        [ Character set. Match any character in the set.
        0-9 Range. Matches a character in the range "0" to "9" (char code 48 to 57).
        ]
        + Plus. Match 1 or more of the preceding token.
    )
)
(
    ?: Non-capturing group. Groups multiple tokens together without creating a capture group.
    \. Escaped character. Matches a "." character (char code 46).
    [ Character set. Match any character in the set.
    a-z Range. Matches a character in the range "a" to "z" (char code 97 to 122).
    ]
    + Plus. Match 1 or more of the preceding token.
)
$ End. Matches the end of the string, or the end of a line if the multiline flag (m) is enabled.