Question

我有一个网址：

/冰淇淋/东西/夹层/香蕉

如果满足以下条件，我想编写一个仅与URL匹配的正则表达式：

＆＃34;冰淇淋＆＃34;在URL中
＆＃34;三明治＆＃34;在网址中，来自＆＃34; ice-cream＆＃34;
＆＃34;香蕉＆＃34;不在网址

我试过这个：冰淇淋。三明治。 ^ [（香蕉）]以及许多其他人但尚未找到解决方案。

帮助很感激。

Answer 1

试试下面的正则表达式，

^(?!.*banana.*).*?ice-cream.*?sandwich.*$

OR

^(?!.*banana.*)(?:(?!sandwich).)*ice-cream.*?sandwich.*$

DEMO

<强>解释

^断言我们在行的开头。
(?!.*banana.*)检查该行的否定前瞻包含字符串banana。如果不是，那么正则表达式引擎会在启动时设置标记。或者，它会跳过包含字符串banana。
(?:(?!sandwich).)*匹配所有不属于字符串sandwich的字符。
ice-cream.*?sandwich.*字符串三明治必须在字符串ice-cream之后。
$行尾。

Answer 2

如果没有匹配和不匹配的示例，很难准确，但尝试一下：

^(?!.*banana)(?:(?!.*sandwich(?=.*ice-cream))).*ice-cream.*sandwich.*$

正则表达式的解释：

^(?!.*banana)(?:(?!.*sandwich(?=.*ice-cream))).*ice-cream.*sandwich.*$
----------------------------------------------------------------------

^(?!.*banana)(?:(?!.*sandwich(?=.*ice-cream))).*ice-cream.*sandwich.*$

Options: Case insensitive; Exact spacing; Dot doesn't match line breaks; ^$ match at line breaks; Default line breaks

Assert position at the beginning of a line «^»
Assert that it is impossible to match the regex below starting at this position (negative lookahead) «(?!.*banana)»
   Match any single character that is NOT a line break character «.*»
      Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
   Match the character string “banana” literally «banana»
Match the regular expression below «(?:(?!.*sandwich(?=.*ice-cream)))»
   Assert that it is impossible to match the regex below starting at this position (negative lookahead) «(?!.*sandwich(?=.*ice-cream))»
      Match any single character that is NOT a line break character «.*»
         Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
      Match the character string “sandwich” literally «sandwich»
      Assert that the regex below can be matched, starting at this position (positive lookahead) «(?=.*ice-cream)»
         Match any single character that is NOT a line break character «.*»
            Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
         Match the character string “ice-cream” literally «ice-cream»
Match any single character that is NOT a line break character «.*»
   Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
Match the character string “ice-cream” literally «ice-cream»
Match any single character that is NOT a line break character «.*»
   Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
Match the character string “sandwich” literally «sandwich»
Match any single character that is NOT a line break character «.*»
   Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
Assert position at the end of a line «$»

Created with RegexBuddy

Answer 3

.*ice-cream.+sandwich.(?!banana).*

试试这个

正则表达式不匹配字符串

3 个答案: