A regex survival kit for non-programmers

Regular expressions look hostile and they are — but the small subset that matters fits on an index card.

Why this matters today

Anchors, character classes, quantifiers, groups, alternation, and a handful of escapes. Learn those six tools well and you'll never need to install a parser for a one-off cleanup again.

Regex is a five-minute conversation with a slightly hostile genie.

In practice

Here is the part that turns theory into a habit:

• Start small — a single file, a single page, a single test.
• Measure twice. Trust the numbers, not the vibe.
• Keep an undo path. Reversible decisions buy you courage.

A note on tooling

Every tool on this site runs in your browser unless we say otherwise. That changes the trade-offs: nothing to upload, nothing to retain, nothing to leak. The downside is a small ceiling on file size and a dependency on your device's CPU — both acceptable for most editorial workflows.

Takeaway

Don't memorise regex — bookmark it.