[英]extract values from regular expression : c#
我有字符串“ 1P2R”。 我只想使用正則表達式從中提取P&R的計數。 我嘗試了以下代碼,但是沒有用。
String regex = "[0-9]+[P]?[0-9]+[R]?";
String input = "1P2R";
MatchCollection coll = Regex.Matches(input, regex);
String result = coll[0].Groups[1].Value;
要么
String regex = "[0-9]+[P]?[0-9]+[R]?";
String input = "1P2R";
Match match = Regex.Match(input, regex);
if (match.Success)
{
string key = match.Value;
}
兩種方法均未給出結果。 我該如何實現?
我將代碼更改如下...
String regex = "[0-9]+[P]?[0-9]+[R]?";
String input = "1P2R";
Match match = Regex.Match(input, regex);
if (match.Success)
{
string a, b;
a = input.Substring(0, input.LastIndexOf("P"));
b = input.Substring(input.LastIndexOf("P") + 1, input.LastIndexOf("R") - input.LastIndexOf("P")-1);
}
可以嗎
問候塞巴斯蒂安
要匹配P和R之前的數字,請使用以下命令:
var myRegex = new Regex(@"([0-9]+)P([0-9]+)R");
var myMatch = myRegex.Match(yourString);
string pCount = myMatch.Groups[1].Value;
string rCount = myMatch.Groups[2].Value;
Console.WriteLine(pcount,rcount);
說明
([0-9]+)
捕獲一個或多個數字到組1 P
符合P
([0-9]+)
捕獲一個或多個數字到組2 R
符合R
您好,您可以使用以下代碼段來計算字符串中某個字符的出現次數:
class countPR
{
public static void main(String[] args)
{
String s="1P2R1P2R1P2R1P2R1P2R1P2R1P2R1P2R";
Pattern p = Pattern.compile(".P");
// get a matcher object
Matcher m = p.matcher(s);
int countP = 0;
while(m.find())
{
countP++;
}
System.out.println("P found "+countP+" number of times");
p = Pattern.compile(".R");
m = p.matcher(s);
int countR = 0;
while(m.find())
{
countR++;
}
System.out.println("R found "+countR+" number of times");
}
}
using System;
using System.Text.RegularExpressions;
namespace RegExApplication
{
class Program
{
private static void showMatch(string text, string expr)
{
int count=0;
Console.WriteLine("The Expression: " + expr);
MatchCollection mc = Regex.Matches(text, expr);
foreach (Match m in mc)
{
count++;
}
Console.WriteLine(expr+" found "+count+" number of times");
}
static void Main(string[] args)
{
string str = "1P2R1P2R1P2R1P2R1P2R1P2R1P2R1P2RGIRISHBALODI";
Console.WriteLine("Matching words that start with 'S': ");
showMatch(str, @".P");
showMatch(str, @".R");
Console.ReadKey();
}
}
}
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