What is the C # equivalent, Java equivalent of appendReplacement and appendTail

Question

UPDATE

Here is what I came up with. I have not tested it yet, because it is part of a much larger piece of code that still needs to be ported.

Can you see something that looks out of place?

private const string tempUserBlock = "%%%COMPRESS~USER{0}~{1}%%%";
string html = "some html";
int p = 0;
var userBlock = new ArrayList();

MatchCollection matcher = preservePatterns[p].Matches(html);
int index = 0;
StringBuilder sb = new StringBuilder();
int lastValue = 0;

foreach(Match match in matcher){
    string matchValue = match.Groups[0].Value;

    if(matchValue.Trim().Length > 0) {
        userBlock.Add(matchValue);

        int curIndex = lastValue + match.Index;
        sb.Append(html.Substring(lastValue, curIndex));
        sb.AppendFormat(tempUserBlock, p, index++);

        lastValue = curIndex + match.Length;
    }
}

sb.Append(html.Substring(lastValue));
html = sb.ToString();

---

ORIGINAL MAIL BELOW:

Here is the original Java:

private static final String tempUserBlock = "%%%COMPRESS~USER{0}~{1}%%%";
String html = "some html";
int p = 0;
List<String> userBlock = new ArrayList<String>();

Matcher matcher = patternToMatch.matcher(html);
int index = 0;
StringBuffer sb = new StringBuffer();
while (matcher.find())
{
    if (matcher.group(0).trim().length() > 0)
    {
        userBlock.add(matcher.group(0));
        matcher.appendReplacement(sb, MessageFormat.format(tempUserBlock, p, index++));
    }
}
matcher.appendTail(sb);
html = sb.toString();

And my C # conversion is still

private const string tempUserBlock = "%%%COMPRESS~USER{0}~{1}%%%";
string html = "some html";
int p = 0;
var userBlock = new ArrayList();

MatchCollection matcher = preservePattern.Matches(html);
int index = 0;
StringBuilder sb = new StringBuilder();

for(var i = 0; i < matcher.Count; ++i){
    string match = matcher[i].Groups[0].Value;
    if(match.Trim().Length > 0) {
        userBlock.Add(match);
        // WHAT DO I DO HERE?
        sb.Append( string.Format(tempUserBlock, p, index++) );            
    }
}
// WHAT DO I DO HERE?
matcher.appendTail(sb);
html = sb.toString();

See the comment above where I ask: “WHAT TO DO HERE?”

Explanation
The above Java code replaces a string with some HTML. It saves the original replaced text because it needs to be reinserted later after some compression of the space has been completed.

Answer 1

Java appendReplacement/appendTail;.NET - : MatchEvaluator. :

string holder = "Element {0} = {1}";
string s0 = "111 222 XYZ";
ArrayList arr = new ArrayList();

string s1 = Regex.Replace(s0, @"\d+",
  m => string.Format(holder, arr.Add(m.Value), m.Value)
);

Console.WriteLine(s1);
foreach (string s in arr)
{
  Console.WriteLine(s);
}

:

Element 0 = 111 Element 1 = 222 XYZ
111
222

MatchEvaluator, . (-), , .

Answer 2

Java, #, , :

private const string tempUserBlock = "%%%COMPRESS~USER{0}~{1}%%%"; 
string html = "some html"; 
int p = 0; 
var userBlock = new List<string>(); 

MatchCollection matcher = preservePattern.Matches(html); 
StringBuilder sb = new StringBuilder(); 
int last = 0;
foreach (Match m in matcher)
{
    string match = m.Groups[0].Value; 
    if(match.Trim().Length > 0) { 
        userBlock.Add(match); 
        sb.Append(html.Substring(last, m.Index - last));
        sb.Append(m.Result(string.Format(tempUserBlock, p, index++)));
    }
    last = m.Index + m.Length;
}
sb.Append(html.Substring(last));
html = sb.ToString();