Dummu - Version Control Tip in Regex

History is only useful later if it is honest about what happened and when.

Why this matters for Regex

This is a bold claim, an italic aside, and an underlined point, all in one Regex example.

What it touches:

• The Regex runtime or interpreter
• Whatever calls the code around it
• Anyone reading this six months from now

How to apply it:

1. Read the snippet below once, slowly.
2. Try changing one value and predict the output before running it.
3. Compare your prediction against what actually happens.

"Future you, reading this log during an incident, will be grateful for the extra care."

'2026-08-26'.match(/^(\d{4})-(\d{2})-(\d{2})$/);
// ['2026-08-26', '2026', '08', '26']

Reference: Regex documentation

Future you, reading this log during an incident, will be grateful for the extra care.