Golang 正则表达式 – 我做错了什么？

huangapple
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英文:

Golang Regular Expressions - what am I doing incorrectly?

问题

作为一个个人项目，我试图通过将其应用于某些东西来学习Go（lang），我正在编写一个EMCAScript/JavaScript“编译器”；它最初只会允许您包含其他.js文件。

除了功能之外，我正在努力弄清楚regexp包。这是一个似乎不按我所希望的方式工作的代码片段：

// 注意：“lines”是一个字符串数组。

var includeRegex，_ = regexp.Compile（“^[ \t]*include[(]{1}"([^"]+)"[)]{1};"）
for _，line：= range lines {
var isInclude = includeRegex.Match（[]byte（line））
if isInclude {
var includeFile = includeRegex.FindString（line）
fmt.Println（“INCLUDE”，includeFile）
} else {
// ...
}
}

我已经遇到了Go的正则表达式子集，这就是为什么正则表达式不会读取为^\s*include\("([^"]+)"\);的原因。我已经在RegexPal中测试了首选和Go风格的正则表达式，两者都有效。匹配似乎从未发生过；我做错了什么？

值得一提的是，我正在尝试解析的include()语句如下所示：

include（“somefile.js”）;

编辑：值得一提的是，我将代码保留在此处。

英文:

As a personal project, trying to learn Go(lang) by applying it to something, I am writing an EMCAScript/JavaScript "compiler"; all it will (initially) do is allow you to include other .js files.

Functionality aside, I am pulling my hair out trying to figure out the regexp package. Here is the snippet that does not seem to be doing what I want it to:

  1. // Note: "lines" is an array of strings.
  3. var includeRegex, _ = regexp.Compile("^[ \t]*include[(]{1}\"([^\"]+)\"[)]{1};")
  4. for _, line := range lines {
  5.    var isInclude = includeRegex.Match([]byte(line))
  6.    if isInclude {
  7.       var includeFile = includeRegex.FindString(line)
  8.       fmt.Println("INCLUDE", includeFile)
  9.    } else {
  10.       // ...
  11.    }

I have already stumbled across Go's subset of regular expressions, hence why the regex does not read as ^\s*include\("([^"]+)"\);. I have already tested both the preferred, and the Go-style regex, in RegexPal, and both definitely work. The match just never seems to occurr; what am I doing wrong?

For what it's worth, the include() statement I am trying to parse looks like so:

  1. include("somefile.js");

EDIT: For what it's worth, I am keeping the code here.

答案1

得分: 1

这似乎适用于最新的每周版本

  1. package main
  3. import (
  4.         "fmt"
  5.         "log"
  6.         "regexp"
  7.         "strings"
  8. )
  10. func main() {
  11.         includeRegex, err := regexp.Compile(`^\s*include\("(\\\"|[^"])+");`)
  12.         if err != nil {
  13.                 log.Fatal(err)
  14.         }
  16.         for _, line := range strings.Split(`
  17. foo
  18. include "abc.def"
  19. include("file.js");
  20.             include "me\"to\"";
  21.             include("please\"!\"");
  22.         nothing here          
  23. `, "\n") {
  24.                 if includeRegex.Match([]byte(line)) {
  25.                         includeFile := includeRegex.FindString(line)
  26.                         fmt.Println("INCLUDE", includeFile)
  27.                 } else {
  28.                         fmt.Printf("no match for \"%s\"\n", line)
  29.                 }
  30.         }
  31. }

输出：

  1. $ go build && ./tmp 
  2. no match for ""
  3. no match for "foo"
  4. no match for "include "abc.def""
  5. INCLUDE include("file.js");
  6. no match for "  	  include "me\"to\"""
  7. INCLUDE   	  include("please\"!\"");
  8. no match for "	nothing here	  "
  9. no match for ""
  10. $
英文:

This seems to work with the latest weekly

  1. package main
  3. import (
  4.         "fmt"
  5.         "log"
  6.         "regexp"
  7.         "strings"
  8. )
  10. func main() {
  11.         includeRegex, err := regexp.Compile(`^\s*include\("(\\\"|[^"])+"\);`)
  12.         if err != nil {
  13.                 log.Fatal(err)
  14.         }
  16.         for _, line := range strings.Split(`
  17. foo
  18. include "abc.def"
  19. include("file.js");
  20.             include "me\"to\""
  21.             include("please\"!\"");
  22.         nothing here          
  23. `, "\n") {
  24.                 if includeRegex.Match([]byte(line)) {
  25.                         includeFile := includeRegex.FindString(line)
  26.                         fmt.Println("INCLUDE", includeFile)
  27.                 } else {
  28.                         fmt.Printf("no match for \"%s\"\n", line)
  29.                 }
  30.         }
  31. }

Output:

  1. $ go build && ./tmp 
  2. no match for ""
  3. no match for "foo"
  4. no match for "include "abc.def""
  5. INCLUDE include("file.js");
  6. no match for "  	  include "me\"to\"""
  7. INCLUDE   	  include("please\"!\"");
  8. no match for "	nothing here	  "
  9. no match for ""
  10. $

答案2

得分: 1

尝试将以下行放在程序的开头：

  1. println(runtime.Version())

它应该打印出weekly.2012-03-13或接近该日期的内容。

英文:

Try putting the following line at the start of your program:

  1. println(runtime.Version())

It should print weekly.2012-03-13 or something close to that date.

huangapple
  • 本文由 发表于 2012年3月14日 23:28:37
  • 转载请务必保留本文链接：https://go.coder-hub.com/9704895.html
  • go
  • regex
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