如何编写可以捕获每个匹配的编号计数的替换模式？ [英] How can you write a substitution pattern that can capture the numbered count for each match ?

问题描述

如何编写可以捕获每个匹配的编号计数的替换模式？

例如，如果我希望字符串中的第一个问号被替换为？1，第二个问号应该是替换为？2等等。
然后，作为示例，如果我将使用以下字符串作为输入：
" abc？防范？ ijk？ 123？ 55555？ 987"
然后在替换之后，得到的输出字符串应该变成这样：
" abc？ 1 defgh？ 2 ijk？ 3 123？ 4 55555？ 5 987"

/ Tom

解决方案

我找到了一种方法，通过使用具有MatchEvaluator委托方法的类来跟踪编号的事件，但是没有任何类型的替换模式可以用来以更直接的方式实现同​​样的事情吗？

这是我到目前为止找到的唯一解决方案：



公共类MatchEvaluatorConcatenatingNumberedOccurrenceAfterEachMatch

{

private int numbersOccurrence = 0;

公共字符串concatenateNumberedOccurrenceAfterEachMatch（匹配匹配）

{

numbersOccurrence ++; < br>
返回" " + match.Groups [1] .Value + numberedOccurrence +" " ;;

}

}



[测试]

public void TestConcatenateNumberedOccurrenceAfterEachMatch（）

{

string inputString =" abc？防范？ ijk？ 123？ 55555？ 987" ;; $
MatchEvaluatorConcatenatingNumberedOccurrenceAfterEachMatch myMatchEvaluator = new MatchEvaluatorConcatenatingNumberedOccurrenceAfterEachMatch（）;

string substitutedString = Regex.Replace（

inputString，

" （\\？）"，

myMatchEvaluator.concatenateNumberedOccurrenceAfterEachMatch // MatchEvaluator委托

）;

Assert.AreEqual（" abc？1 defgh ？2 ijk？3 123？4 55555？5 987"，substituteString）;



}



/ Tom

How can you write a substitution pattern that can capture the numbered count for each match ?

For example if I would want the first questionmark in a string become replaced with ?1 , and the second questionmark should be replaced with ?2 and so on.
Then, as an example, if I would use the following string as input:
"abc ? defgh ? ijk ? 123 ? 55555 ? 987"
then after the substitutions, the resulting output string should become this:
"abc ?1 defgh ?2 ijk ?3 123 ?4 55555 ?5 987"

/ Tom

解决方案

I found a way of doing it by using a class with a MatchEvaluator delegate method that keeps track of the numbered occurrence, but is not there any kind of replacement pattern that can be used to achieve the same thing in a more straightforward way ?
This is the only solution I have found so far:

        public class MatchEvaluatorConcatenatingNumberedOccurrenceAfterEachMatch
        {
            private int numberedOccurrence = 0;
            public string concatenateNumberedOccurrenceAfterEachMatch(Match match)
            {
                numberedOccurrence++;
                return " " + match.Groups[1].Value + numberedOccurrence + " ";
            }
        }

        [Test]
        public void TestConcatenateNumberedOccurrenceAfterEachMatch()
        {
            string inputString = "abc ? defgh ? ijk ? 123 ? 55555 ? 987";
            MatchEvaluatorConcatenatingNumberedOccurrenceAfterEachMatch myMatchEvaluator = new MatchEvaluatorConcatenatingNumberedOccurrenceAfterEachMatch();
            string substitutedString = Regex.Replace(
                inputString,
                " (\\?) ",
                myMatchEvaluator.concatenateNumberedOccurrenceAfterEachMatch // MatchEvaluator delegate
            );
            Assert.AreEqual("abc ?1 defgh ?2 ijk ?3 123 ?4 55555 ?5 987", substitutedString);
           
        }

/ Tom

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