Regex Groups and Captures

Groups let one pattern match several parts at once and read them back. Capturing groups change the match result; non-capturing groups only group.

01Steps

• Wrap the part you want to read back in parentheses.
• Use (?: ) when you only need to group, not capture.
• Read named groups by name instead of by index.
• Check the full match and each group separately.

02Limitations

Covers ECMAScript group syntax; other engines differ and may not support every construct.