正则表达式中的位置和长度

I have text like this:

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}.

这是一个示例{text}。我想通知我的{Dada}我有一些{无用}的数据。所以我需要数据以{开头}结束。这些数据需要{找出}。

Total text have some substrings separated within curly braces {}. How can I find the starting position and length of the substring starting with { and ending with }? Further, I will replace the substring with the processed string.

总文本在花括号{}内分隔了一些子串。如何找到以{和以}结尾的子字符串的起始位置和长度?此外,我将用已处理的字符串替换子字符串。

2 个解决方案

#1

With Regex.Match, you can check the index of each match by accessing the Index property, and the length of each match by checking the Length property.

使用Regex.Match,您可以通过访问Index属性来检查每个匹配的索引,并通过检查Length属性来检查每个匹配的长度。

If you want to count the curly braces in, you can use \{(.*?)\} regex, like this:

如果你想计算花括号,你可以使用\ {(。*?)\}正则表达式,如下所示:

 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();

Outputs:

Perhaps, you will want to use a dictionary with search and replace terms, and that will be more effecient:

也许,你会想要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]);

Output:

#2

If you know you will not have nested curly braces, you can use the following:

如果您知道不会嵌套花括号,则可以使用以下内容:

var input = @"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 pattern = @"{[^]*}"
foreach (Match match in Regex.Matches(input, pattern)) {
    string subString = match.Groups(1).Value;
    int start = match.Groups(1).Index;
    int length = match.Groups(1).Length;
}