正则表达式从URL获取ID

这可能不是正则表达式的工作，而是您选择的语言中的现有工具的工作。正则表达式不是你在涉及字符串的所有问题上挥舞的魔杖。您可能希望使用已经编写、测试和调试过的现有代码。

在PHP中，使用parse_url函数

Perl: URI module.

Ruby: URI module.

。. NET: 'Uri'类

$zeichenkette = "my-domain/product/name-product-ID123.html"; $suchmuster = '/ID[0-9]{3}/'; preg_match($suchmuster, $zeichenkette, $treffer, PREG_OFFSET_CAPTURE, 3); print_r($treffer);

应该打印ID123

试试这个:

(?<=product-)ID[0-9]+(?='.html)

• (?<=product-) Positive Lookbehind -断言ID前面有字符串product-

• ID匹配字符ID

• [0-9]+匹配数字序列

• (?='.html) Positive Lookahead -断言ID后面跟着.html

我是这么想的:

(?!-)(ID[0-9]*)(?='.)

测试:http://regex101.com/r/rP0vI2

如果不是"ID"，则为:

(?!-)([A-Z]{2}[0-9]*)(?='.)

测试:http://regex101.com/r/dW8qK0

简短有效:

<?php
$links = <<< LOB
my-domain/product/name-product-ID123.html
my-domain/product/name-product-ID123.html/
my-domain/product/name-product-ID123.html?bla=123&some=456
LOB;
preg_match_all('/-(ID'd+)'./',$links ,$ids, PREG_PATTERN_ORDER);
for ($i = 0; $i < count($ids[1]); $i++) {
    echo $ids[1][$i]."'n";
}
/*
ID123
ID123
ID123
*/
?>

现场演示:
http://ideone.com/OqhL6b

解释:

Match the character “-” literally «-»
Match the regular expression below and capture its match into backreference number 1 «(ID'd+)»
   Match the characters “ID” literally «ID»
   Match a single digit 0..9 «'d+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Match the character “.” literally «'.»