dongxia9519
dongxia9519
2016-08-13 14:50
浏览 808
已采纳

解析regexp时出错:Perl语法无效或不受支持:`(?!

When I try this regex in golang I'm getting regex parsing error.

error parsing regexp: invalid or unsupported Perl syntax: (?!

regexp.MustCompile("^(?!On.*On\\s.+?wrote:)(On\\s(.+?)wrote:)$"),

Can someone tell me why its not working and help me to fix this issue?

Thanks

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1条回答 默认 最新

  • dssnh86244
    dssnh86244 2016-08-13 16:58
    已采纳

    Go regex does not support lookarounds.

    As a workaround, you may use

    regexp.MustCompile("^On\\s(.+?)wrote:$")
    

    and

    regexp.MustCompile("^On.*On\\s.+?wrote:")
    

    and check if the first one matches the string and the second does not.

    You could also add an optional capturing group (.*On)?

    regexp.MustCompile("^On(.*On)?\\s.+?wrote:")
    

    and check if there is a match and return true if the Group 1 ends with On - if yes, return false, else true.

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