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HomeBackend DevelopmentPHP Tutorial采集获取,关于正则表达式的多条结果,只获取1条

采集获取,关于正则表达式的多条结果,只获取1条,


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表达式 获取结果 /
  • (.*?)
  • /i 匹配多条出来。也就是所有。

    有个疑问。

     只获取第一条。
     或者只获取最后一条。
     这正则怎么写?
     获取第一条,很多人认为会  /
      .*
    • (.*?)
    • / 除开这种,还会有其他吗?



      回复讨论(解决方案)

      匹配第一条
      用preg_match 不就行了
      最后一条可以用 /

    • (.*?)\s*/ 

      匹配第一条
      用preg_match 不就行了
      最后一条可以用 /

    • (.*?)\s*/ 

      规则里有多个(.*?)的,需要返回的做数组处理。

      例如
      /
    • ^2013-(.*?)(.*?)
    • /
      这样的话,后边不需要启动贪婪模式 U 吗
      同时也需要  preg_match_all 的?

      你不是要获取一条吗,用preg_match 就可以了。

      规则里有多个(.*?)的,需要返回的做数组处理。
      这个有影响吗,举例说明看看。

      preg_match_all 返回的是数组,你可以选择用哪一条结果

      你不是要获取一条吗,用preg_match 就可以了。

      规则里有多个(.*?)的,需要返回的做数组处理。
      这个有影响吗,举例说明看看。

      测试了。正如你所说的。返回做数组是没影响的。

      preg_match_all 返回的是数组,你可以选择用哪一条结果

      其实 preg_match_all 和preg_match 都一样。1个是匹配所有合适的。一个是匹配一条合适的。

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