如何提取括号(圆括号)之间的文本？

Question

我有一个字符串User name (sales),我想在括号之间提取文本,我该怎么做？

我怀疑子字符串,但我无法弄清楚如何阅读,直到结束括号,文本的长度会有所不同.

Answer 1

一个非常简单的方法是使用正则表达式:

Regex.Match("User name (sales)", @"\(([^)]*)\)").Groups[1].Value

作为对(非常有趣的)评论的回应,这里有相同的正则表达式,并有一些解释:

\(             # Escaped parenthesis, means "starts with a '(' character"
    (          # Parentheses in a regex mean "put (capture) the stuff 
               #     in between into the Groups array" 
       [^)]    # Any character that is not a ')' character
       *       # Zero or more occurrences of the aforementioned "non ')' char"
    )          # Close the capturing group
\)             # "Ends with a ')' character"

Answer 2

如果你想远离正则表达式,我能想到的最简单的方法是:

string input = "User name (sales)";
string output = input.Split('(', ')')[1];

Answer 3

假设你只有一对括号.

string s = "User name (sales)";
int start = s.IndexOf("(") + 1;
int end = s.IndexOf(")", start);
string result = s.Substring(start, end - start);

Answer 4

使用此功能:

public string GetSubstringByString(string a, string b, string c)
    {
        return c.Substring((c.IndexOf(a) + a.Length), (c.IndexOf(b) - c.IndexOf(a) - a.Length));
    }

这是用法:

GetSubstringByString("(", ")", "User name (sales)")

输出将是:

sales

Answer 5

正则表达式可能是这里最好的工具.如果你不熟悉它们,我建议你安装Expresso - 一个很棒的小正则表达式工具.

就像是:

Regex regex = new Regex("\\((?<TextInsideBrackets>\\w+)\\)");
string incomingValue = "Username (sales)";
string insideBrackets = null;
Match match = regex.Match(incomingValue);
if(match.Success)
{
    insideBrackets = match.Groups["TextInsideBrackets"].Value;
}

Answer 6

string input = "User name (sales)";

string output = input.Substring(input.IndexOf('(') + 1, input.IndexOf(')') - input.IndexOf('(') - 1);

Answer 7

一个正则表达式可能吗？我认为这会奏效......

\(([a-z]+?)\)

Answer 8

using System;
using System.Text.RegularExpressions;

private IEnumerable<string> GetSubStrings(string input, string start, string end)
{
    Regex r = new Regex(Regex.Escape(start) +`"(.*?)"`  + Regex.Escape(end));
    MatchCollection matches = r.Matches(input);
    foreach (Match match in matches)
    yield return match.Groups[1].Value;
}

Answer 9

int start = input.IndexOf("(") + 1;
int length = input.IndexOf(")") - start;
output = input.Substring(start, length);