PHP如何匹配不包含某些关键词正则写法资源-CSDN下载

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在PHP中，正则表达式是一种强大的文本处理工具，它能帮助我们匹配、查找、替换或提取特定模式的字符串。当我们需要匹配不包含某些特定关键词的字符串时，我们需要使用否定前瞻（Negative Lookahead）或者否定后瞻（Negative Lookbehind）。在PHP中，这两种前瞻后瞻都是以 `(?!...)` 和 `(?<!...)` 的形式出现。让我们来理解什么是否定前瞻（Negative Lookahead）`(?!...)`。这是一个零宽度断言，它检查接下来的字符串是否不匹配括号内的模式。如果后面的字符串匹配了，那么整个匹配就会失败。举个例子，如果我们想匹配所有不包含 "not" 的单词，可以这样写： ```php preg_match_all('/\b(?!not)\w+\b/', 'this is not a test', $matches); ``` 在这个例子中，`\b` 表示单词边界，`(?!not)` 是否定前瞻，确保后面不是 "not"，`\w+` 匹配一个或多个字母数字字符。所以 "test" 将会被匹配，而 "not a test" 不会。再来说说否定后瞻（Negative Lookbehind）`(?<!...)`，它的作用与否定前瞻类似，但是它是向前看而不是向后看。也就是说，它检查前面的字符串是否不匹配括号内的模式。例如，要匹配所有不在 "the" 之后的单词，可以这样写： ```php preg_match_all('/(?<!the)\b\w+\b/', 'the cat in the hat', $matches); ``` 在这个例子中，`(?<!the)` 意味着前面不能是 "the"，所以 "cat" 和 "hat" 都会被匹配，但 "the" 不会。需要注意的是，否定后瞻对前面的模式有长度限制，它必须是固定长度或者有限的非贪婪重复，因为PHP的PCRE引擎（Perl Compatible Regular Expressions）无法有效地处理无限长度的否定后瞻。在实际应用中，我们需要根据具体需求灵活运用这些正则表达式构造方法。比如，如果我们要匹配所有不包含 "not" 或 "no" 的单词，可以组合使用多个否定前瞻： ```php preg_match_all('/\b(?!not)(?!no)\w+\b/', 'this is not a no test', $matches); ``` 这样，"test" 就会被匹配，而 "not" 和 "no" 不会。 PHP的正则表达式功能强大，能够处理复杂的字符串匹配需求，包括匹配不包含特定关键词的情况。通过熟练掌握否定前瞻和否定后瞻，我们可以编写出更精确的正则表达式，以满足各种复杂的文本处理任务。

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PHP正则匹配不包含.zip （26个子文件）

PHP正则匹配不包含

negate-match.html 50KB

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