dsa1230000 2014-08-13 22:03
浏览 350
已采纳

preg_match优化 - 正则表达式太慢了

(.[^ ]*?)\[code](.*?)\[\/code](.[^ ]*?)(*SKIP)(*F)|(.[^ ]*?)\[php](.*?)\[\/php](.[^ ]*?)(*SKIP)(*F)|some_rules_here

The pattern above makes the function work too slow.

With it: http://regex101.com/r/qP4tT5/1 Page gets loaded in more than 3 seconds. Regex debugger says it took 5153 steps in total to execute the regex.

Without it: http://regex101.com/r/fG4tW0/1 Page gets loaded in only 0,3 seconds Regex debugger says it took only 4 steps to execute the regex.

Why do I have to use it: Because if the emoticon's shortcut is inside a [code] or [php] tag, it shouldn't be HTMLed.

Is there an alternative method which does the same thing faster?

  • 写回答

1条回答 默认 最新

  • doupin8555 2014-08-13 22:13
    关注

    You can simplify this regular expression a bit.

    ~\[(code|php)][^[]*\[/\1](*SKIP)(*F)|:\(~i
    

    enter image description here

    Live Demo

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

报告相同问题?

悬赏问题

  • ¥15 运筹学排序问题中的在线排序
  • ¥15 关于docker部署flink集成hadoop的yarn,请教个问题 flink启动yarn-session.sh连不上hadoop,这个整了好几天一直不行,求帮忙看一下怎么解决
  • ¥30 求一段fortran代码用IVF编译运行的结果
  • ¥15 深度学习根据CNN网络模型,搭建BP模型并训练MNIST数据集
  • ¥15 C++ 头文件/宏冲突问题解决
  • ¥15 用comsol模拟大气湍流通过底部加热(温度不同)的腔体
  • ¥50 安卓adb backup备份子用户应用数据失败
  • ¥20 有人能用聚类分析帮我分析一下文本内容嘛
  • ¥30 python代码,帮调试,帮帮忙吧
  • ¥15 #MATLAB仿真#车辆换道路径规划