dongxuan1314 2015-11-18 12:51
浏览 1066
已采纳

golang regexp.matchString有什么问题?

can any one explain why does this match play?

Source:

package main

import "fmt"
import "regexp"

func main() {
    match, _ := regexp.MatchString("[a-z]+", "test?")
    fmt.Printf("the result of match: %v", match)
}

isn't the golang's regexp.MatchString is fully match? I can't understand and I am a newbie for golang

  • 写回答

1条回答 默认 最新

  • dqjgf0982 2015-11-18 14:07
    关注

    The regular expression "[a-z]+" will match "test" is the search text "test?".
    Similarly, it will match "testing testing", "2001 a space oddessy", etc.

    Go lang's regexp package matches search text according to the syntax and meaning of the regular expression. There isn't a method which itself tries to match the regular expression with the entire search text, and gives up if it can't, unless the regular expression defines that an entire search-text-match is the required behaviour.

    The syntax of regular expressions does enable matching the entire search text.

    '^', the start-anchor symbol at the start of the regular expression forces the match to include the start of the search text.
    '$', the end-anchor symbol at the end of the regular expression forces the match to include the end of the search text.
    They have different meaning in other positions within a regular expression.

    As @TomCooper commented, use both start and end anchors around the regular expression pattern you are looking for. These anchor the enclosed regular expression to the start and end of the search text to ensure the entire search text matches the regular expression.

    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 matlab数字图像处理频率域滤波
  • ¥15 在abaqus做了二维正交切削模型,给刀具添加了超声振动条件后输出切削力为什么比普通切削增大这么多
  • ¥15 ELGamal和paillier计算效率谁快?
  • ¥15 file converter 转换格式失败 报错 Error marking filters as finished,如何解决?
  • ¥15 ubuntu系统下挂载磁盘上执行./提示权限不够
  • ¥15 Arcgis相交分析无法绘制一个或多个图形
  • ¥15 关于#r语言#的问题:差异分析前数据准备,报错Error in data[, sampleName1] : subscript out of bounds请问怎么解决呀以下是全部代码:
  • ¥15 seatunnel-web使用SQL组件时候后台报错,无法找到表格
  • ¥15 fpga自动售货机数码管(相关搜索:数字时钟)
  • ¥15 用前端向数据库插入数据,通过debug发现数据能走到后端,但是放行之后就会提示错误