Product definition
Kept the one-day tool focused on one decision: verify exactly what a JavaScript regular expression will match and replace.
Open Source / Regular Expressions / Daily Build
Regex Playground
/ Overview
A dependency-free JavaScript regex tester with highlighted matches, capture-group details and replacement previews.
Regular expressions compress a lot of behavior into a small pattern, making match boundaries, capture groups and replacement results difficult to verify by inspection alone.
/ Provided servicesClear thinking.
Clear thinking.
Practical delivery.
Interface design
Organized pattern, test text, match details and replacement output into a responsive four-panel neo-brutalist workspace.
Engineering
Separated flag validation, compilation, matching, segmentation and replacement into reusable functions with zero-length match protection.
/ Solution
I built a local browser playground that compiles JavaScript patterns and flags, highlights every match, reports positions and groups, and previews replacement syntax without sending test text anywhere.
/ Impact
Local-only text processing
Visible match boundaries and positions
Capture and replacement inspection
Eight passing logic tests
JavaScript RegExp
Dynamic patterns, validated flags, global scanning, named and numbered capture groups, and native replacement syntax.
HTML & CSS
Semantic form controls, live status feedback, safe text-node rendering and a responsive dependency-free interface.
Node test runner
Eight tests cover flags, invalid patterns, matches, capture groups, zero-length safety, segments and replacements.