C#中使用Regex.Split按特定规则分割含保留字的字符串

The tricky part here is avoiding splits on apostrophes inside values (like O' Brian) while correctly splitting at the closing quotes of each field. Here's a solution that targets only valid field boundaries:

Step-by-Step Explanation #

We need to split on a closing single quote that's followed by spaces and one of your reserved words (plus an equals sign, to ensure it's a field start). Using a positive lookahead lets us target these boundaries without including the reserved word in the split separator.

Code Implementation #

using System;
using System.Linq;
using System.Text.RegularExpressions;

class FieldSplitter
{
    static void Main()
    {
        string criteria = "NAME='Eduard O' Brian' COURSE='Math II' TEACHER = 'Chris Young' SCHEDULE='3' CAMPUS='C-1' ";
        string[] reservedWords = { "NAME", "COURSE", "TEACHER", "SCHEDULE", "CAMPUS" };
        
        // Regex pattern: Match a closing quote followed by spaces and a reserved word + equals
        // Non-capturing group avoids extra entries in split result
        string splitPattern = $@"'(?=\s+(?:{string.Join("|", reservedWords)})\s*=)";
        
        // Split the string
        string[] rawSegments = Regex.Split(criteria, splitPattern);
        
        // Clean up: Remove empty entries and trim whitespace
        var cleanedSegments = rawSegments
            .Where(segment => !string.IsNullOrWhiteSpace(segment))
            .Select(segment => segment.Trim());
        
        // Output the result
        foreach (var segment in cleanedSegments)
        {
            Console.WriteLine(segment);
        }
    }
}

How the Regex Works #

• ': Matches a single quote.
• (?=\s+(?:NAME|COURSE|TEACHER|SCHEDULE|CAMPUS)\s*=): Positive lookahead that verifies:
  • \s+: One or more spaces after the quote.
  • (?:...): Non-capturing group of your reserved words.
  • \s*=: Zero or more spaces followed by an equals sign (confirms it's a field start).

This ensures we only split at valid field boundaries, ignoring apostrophes inside values like O' Brian.

Output #

NAME='Eduard O' Brian'
COURSE='Math II'
TEACHER = 'Chris Young'
SCHEDULE='3'
CAMPUS='C-1'

内容的提问来源于stack exchange，提问作者Mercy