c# - 正则表达式中的位置和长度

Question

我有这样的文字:

This is a sample {text}. I want to inform my {Dada} that I have some data which is {not useful}. So I need data to start by { and ends with }. This data needs to {find out}.

总文本有一些子字符串在花括号 {} 中分隔。如何找到以{开始并以}结束的子字符串的起始位置和长度？此外，我将用处理后的字符串替换子字符串。

Answer 1

与 Regex.Match ，您可以通过访问 Index 来检查每个匹配项的索引属性，以及每个匹配项的长度，方法是检查 Length属性(property)。

如果你想计算里面的大括号，你可以使用\{(.*?)\}正则表达式，像这样:

 var txt = "This is a sample {text}. I want to inform my {Dada} that I have some  data which is {not useful}. So I need data to start by { and ends with }. This data needs to {find out}.";
 var rgx1 = new Regex(@"\{(.*?)\}");
 var matchees = rgx1.Matches(txt);
 // Get the 1st capure groups
 var all_matches = matchees.Cast<Match>().Select(p => p.Groups[1].Value).ToList();
 // Get the indexes of the matches
 var idxs = matchees.Cast<Match>().Select(p => p.Index).ToList();
 // Get the lengths of the matches
 var lens = matchees.Cast<Match>().Select(p => p.Length).ToList();

输出:

也许，您会希望使用带有搜索和替换术语的字典，这样会更有效:

var dic = new Dictionary<string, string>();
dic.Add("old", "new");
var ttxt = "My {old} car";
// And then use the keys to replace with the values
var output = rgx1.Replace(ttxt, match => dic[match.Groups[1].Value]);

输出: