[英]C# Regex replace help
I have a string: 我有一个字符串:
Apple1231|C:\\asfae\\drqw\\qwer|2342|1.txt
Apple1231 | C:\\ asfae \\ drqw \\ QWER | 2342 |的1.txt
I have the following code: 我有以下代码:
Regex line2parse = Regex.Match(line,@"(\|)(\|)(\|)(\d)");
if (line2parse < 2)
{
File.AppendAllText(workingdirform2 + "configuration.txt",
What I want to be able to do is replace every |
我想要做的就是更换每个
|
after the first |
在第一个
|
with \\
So i want to write out 用
\\
所以我想写出来
Apple1231|C:\\asfae\\drqw\\qwer\\2342\\1.txt
Apple1231 | C:\\ asfae \\ drqw \\ QWER \\ 2342 \\ 1.TXT
You could do this without regex: 没有正则表达式你可以做到这一点:
string line = @"Apple1231|C:\asfae\drqw\qwer|2342|1.txt";
string[] parts = line.Split('|');
string clean = parts[0] + "|" + string.Join(@"\", parts, 1, parts.Length - 1);
The string.Join call uses an overload that lets you specify a start index to skip the first item. string.Join调用使用重载,允许您指定开始索引以跳过第一个项目。
我不会使用正则表达式,但IndexOf()首先找到“|”,然后从该位置加上.Substring()加1直到结束...先验,它应该表现更好 - 但总是发生在表现,现实惊喜☺
+1 John. +1约翰。 Obviously regular expressions are not the best solution here, but here's my take:
显然正则表达式不是最好的解决方案,但这是我的看法:
string original = @"Apple1231|C:\asfae\drqw\qwer|2342|1.txt";
Regex pattern = new Regex(@"(?<=.*\|)(?'rep'[^\|]*)\|");
string result = pattern.Replace(original, @"${rep}\");
This is more generic than strictly necessary because it will handle an arbitrary number of replacements. 这比非常必要的更通用,因为它将处理任意数量的替换。
既然你要求正则表达式:
var result = Regex.Replace( line, @"(.+?)\|(.+?)\|(.+?)\|(.+?)", "$1|$2\\$3\\$4");
Entirely untested, but try 完全未经测试,但试试
fixed = Regex.Replace(unfixed.replace("|", @"\"), @"\\", "|", 1);
that is- turn all the bars into slashed, then turn the first slash back into a bar. 那就是把所有的条都变成斜线,然后把第一个斜线转回一个条。
Don't use regex. 不要使用正则表达式。
string input = @"Apple1231|C:\asfae\drqw\qwer|2342|1.txt";
int firstPipeIndex = input.IndexOf("|");
string suffix = string.Empty;
string prefix = string.Empty;
string output = string.Empty;
if (firstPipeIndex != -1)
{
//keep the first pipe and anything before in prefix
prefix = input.Substring(0, firstPipeIndex + 1);
//all pipes in the rest of it should be slashes
suffix = input.Substring(firstPipeIndex + 1).Replace('|', '\\');
output = prefix + suffix;
}
if (!string.IsNullOrEmpty(suffix))
{
Console.WriteLine(input);
Console.WriteLine(output);
}
Here's the code that should do the trick: 这是应该做的诀窍的代码:
Regex MyRegex = new Regex( @"(.+\|)(.+)\|(\d{1,})\|(.+)", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.IgnorePatternWhitespace | RegexOptions.Compiled ); // This is the replacement string string MyRegexReplace = @"$1$2\$3\$4"; //// Replace the matched text in the InputText using the replacement pattern string result = MyRegex.Replace(@"Apple1231|C:\asfae\drqw\qwer|2342|1.txt",MyRegexReplace); // result 'Apple1231|C:\asfae\drqw\qwer\2342\1.txt'
Hope this helps, Best regards, Tom. 希望这会有所帮助,最好的问候,汤姆。
This solution only creates two new objects on the heap rather than N objects that the other solutions require. 此解决方案仅在堆上创建两个新对象,而不是其他解决方案所需的N个对象。
static string FixString(string line)
{
if (line == null)
return string.Empty;
int firstBarPosition = line.IndexOf('|');
if (firstBarPosition == -1 || firstBarPosition + 1 == line.Length)
return line;
StringBuilder sb = new StringBuilder(line);
sb.Replace('|', '\\', firstBarPosition + 1, line.Length - (firstBarPosition + 1));
return sb.ToString();
}
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