EGRET and ACRE Regular Expression Testing Tools

Enter regular expression

ACRE: Automatic Checking of Regular Expressions

EGRET: Evil Generation of Regular Expression Tests

Show groups for accepted strings
Select base substring for strings such as \w+ (default is "evil"):

Accepted Strings


Rejected Strings


Try your own test string (optional)


About ACRE and EGRET

Copyright (C) 2018 Eric Larson

Project contributors: Eric Larson, Anna Kirk, Tyler Hartje, and Nicolas Oman

Maintained by Eric Larson (elarson@seattleu.edu) at Seattle University

Additional information about ACRE and EGRET