Regular Expression A powerful text processing tool using specialized syntax to describe and match character patterns. This tool provides a real-time visual testing environment.

Core Features：

• Real-Time Matching & Highlighting: Matching results update instantly in the highlight area as you type, with no need to click any buttons.
• Capturing Group Details: The tool clearly lists each match and all its capturing groups for easy data extraction and debugging.
• Modifiers Support: You can freely enter common regex modifiers like `g` (global match), `i` (case-insensitive), `m` (multiline mode), etc.
• Expression Cheat Sheet: Includes built-in regex for emails, URLs, IP addresses, etc. Click to use instantly.

Common Metacharacters：

• . - Matches any single character except a line break.
• * - Matches the preceding subexpression zero or more times.
• + - Matches the preceding subexpression one or more times.
• ? - Matches the preceding subexpression zero or one time.
• \d - Matches a single digit character. Equivalent to `[0-9]`.
• \w - Matches any word character including underscores. Equivalent to `[A-Za-z0-9_]`.
• \s - Matches any whitespace character, including space, tab, form-feed, etc.
• [abc] - Matches one of `a`, `b`, or `c`.
• (ab) - Matches `ab` and captures it to the first group.
• ^ - Matches the beginning of input.
• $ - Matches the end of input.