Analysis of two examples of regular replacement functions implemented in JS and C#

This article mainly introduces the two regular replacement functions implemented by JS and C#, and analyzes the related implementation methods and precautions for string regular replacement between js and C# based on specific examples. , friends who need it can refer to

The examples in this article describe two regular replacement functions implemented by JS and C#. Share it with everyone for your reference, the details are as follows:

Application example 1:

String to be processed: str="display=test name =mu display=temp"

Requirement: Change the values ​​after display= to localhost

JS processing method:

str.replace(/display=\w*/g,"display=localhost");

C#Processing method:

Regex reg=new Regex(@"display=\w*");
str=reg.Replace(str,"display=localhost");

Application Example 2:

String to be processed: str="display=test name=mu display=temp"

Requirement: The string becomes display= localhosttest name=mu display=localhosttemp

JS processing method:

var reg = /(display=)(\w*)/g;
var result;
while ((result= reg.exec(str))!=null) {
  str= str.replace(result[0], result[1] + "localhost" + result[2]);
}

C#Processing method:

/// <summary>
/// 定义处理方法
/// </summary>
/// <param name="match">符合的字符串</param>
/// <returns></returns>
private string Evaluator(Match match)
{
  //(display=)(\w*) Groups按查找到的字符串再根据分组进行分组
  //第0组为整个符合的字符串，后面的组按括号顺序排
  string str =match.Groups[1].Value+"localhost"+ match.Groups[2].Value;
  return str;
}
Regex regex = new Regex(@"(display=)(\w*)");
string result = regex.Replace(str, Evaluator);

Finally, there is a small summary about js regularity:

The difference between string match and regular object exec

1. When regular expression does not have /g, both return the first matching string or string group (if there is grouping in the regular expression)

2. When the regular expression When the formula has /g, match returns all matching string groups and ignores grouping, and exec returns the first string or string group

PS: Here are 2 more for everyone A very convenient regular expression tool for your reference:

JavaScript Regular expression online testing tool:
http://tools.jb51.net/regex/javascript

Regular expression online generation tool:
http://tools .jb51.net/regex/create_reg

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