C# 提取两个字符之间的字符串？
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Extracting string between two characters?
提问by mr_eclair
I want to extract email id between < >
我想在两者之间提取电子邮件 ID < >
for example.
例如。
input string : "abc" <[email protected]>; "pqr" <[email protected]>;
输入字符串： "abc" <[email protected]>; "pqr" <[email protected]>;
output string : [email protected];[email protected]
采纳答案by L.B
string input = @"""abc"" <[email protected]>; ""pqr"" <[email protected]>;";
var output = String.Join(";", Regex.Matches(input, @"\<(.+?)\>")
.Cast<Match>()
.Select(m => m.Groups[1].Value));
回答by O. R. Mapper
Use the String.IndexOf(char, int)methodto search for <starting at a given index in the string (e.g. the last index that you found a >character at, i.e. at the end of the previous e-mail address - or 0when looking for the first address).
使用该String.IndexOf(char, int)方法<从字符串中的给定索引处开始搜索（例如，您找到>字符所在的最后一个索引处，即在前一个电子邮件地址的末尾 - 或0在查找第一个地址时）。
Write a loop that repeats for as long as you find another <character, and everytime you find a <character, look for the next >character. Use the String.Substring(int, int)methodto extract the e-mail address whose start and end position is then known to you.
编写一个循环，只要找到另一个<字符就一直重复，每次找到一个<字符时，就查找下一个>字符。使用该String.Substring(int, int)方法提取您知道开始和结束位置的电子邮件地址。
回答by Pankaj Agarwal
string str = "\"abc\" <[email protected]>; \"pqr\" <[email protected]>;";
string output = string.Empty;
while (str != string.Empty)
{
output += str.Substring(str.IndexOf("<") + 1, str.IndexOf(">") -1);
str = str.Substring(str.IndexOf(">") + 2, str.Length - str.IndexOf(">") - 2).Trim();
}
回答by Alex
Could use the following regex and some linq.
可以使用以下正则表达式和一些 linq。
var regex = new Regex(@"\<(.*?)\>");
var input= @"""abc"" <[email protected]>; ""pqr"" <[email protected]>";
var matches = regex.Matches(input);
var res = string.Join(";", matches.Cast<Match>().Select(x => x.Value.Replace("<","").Replace(">","")).ToArray());
The <> brackets get removed afterwards, you could also integrate it into RegexI guess.
<> 括号之后被删除，你也可以将它整合到Regex我猜中。
回答by paparazzo
Tested
已测试
string input = "\"abc\" <[email protected]>; \"pqr\" <[email protected]>;";
matchedValuesConcatenated = string.Join(";",
Regex.Matches(input, @"(?<=<)([^>]+)(?=>)")
.Cast<Match>()
.Select(m => m.Value));
(?<=<) is a non capturing look behind so < is part of the search but not included in the output
(?<=<) 是一个非捕获的外观，所以 < 是搜索的一部分，但不包含在输出中
The capturing group is anything not > one or more times
捕获组不是> 一次或多次
Can also use non capturing groups @"(?:<)([^>]+)(?:>)"
也可以使用非捕获组@"(?:<)([^>]+)(?:>)"
The answer from LB +1 is also correct. I just did not realize it was correct until I wrote an answer myself.
LB+1的回答也是正确的。直到我自己写了一个答案，我才意识到这是正确的。
回答by Franco Dipré
Without regex, you can use this:
没有正则表达式，你可以使用这个：
public static string GetStringBetweenCharacters(string input, char charFrom, char charTo)
{
int posFrom = input.IndexOf(charFrom);
if (posFrom != -1) //if found char
{
int posTo = input.IndexOf(charTo, posFrom + 1);
if (posTo != -1) //if found char
{
return input.Substring(posFrom + 1, posTo - posFrom - 1);
}
}
return string.Empty;
}
And then:
进而：
GetStringBetweenCharacters("\"abc\" <[email protected]>;", '<', '>')
GetStringBetweenCharacters("\"abc\" <[email protected]>;", '<', '>')
you will get
你会得到
