StuHub Regex Tester vs regex101 — the dev pick
regex101 is a cult-favourite among developers — it supports PCRE, Python, Go, and JavaScript flavours, explains patterns token-by-token, and stores user-submitted regexes as permanent URLs. StuHub's Regex Tester is narrower in scope (JavaScript flavour only) but runs entirely in your browser and keeps your haystack text private. For quick everyday regex work, StuHub is a lighter, privacy-friendly option; for deep debugging across multiple engines, regex101 is hard to beat.
Feature-by-feature
Frequently asked
Which regex engine should I target?
JavaScript-flavour is the right choice for Node.js and browser work. Python, PCRE, and Go have subtle differences (lookbehind rules, Unicode property escapes) that regex101 makes easy to switch between.
Is my regex stored anywhere?
On StuHub: no. The pattern can be encoded in the URL (so the same link brings it back) but the haystack never leaves your browser. On regex101: the pattern and optionally the test haystack are stored if you save the regex to get a permalink.
Can I use advanced regex features like recursion?
JavaScript regex does not support recursive patterns or named-subroutine calls; for those, you need PCRE or Python. regex101 supports both; StuHub's tester does not.