This simple regular expression tester lets you experiment using your browser's regular expression Javascript function (use View Source in your browser for the Javascript source code).

Enter or copy/paste the string you want to search in the box labled String: and the regular expression in the box labeled RegExp:, click the Search button and results will appear in the box labeled Results:. If you are very lucky the results may even be what you expect. This tester displays the whole searched string in the Results field and encloses in < > the first found result. That may not be terribly helpful if you are dealing with HTML - but our heart is in the right place. All matches are displayed separately showing the found text and its character position in the string. Checking the Case Insensitive: box makes the search case insensitive thus [AZ] will find the "a" in "cat", whereas without checking the box [aZ] would be required to find the "a" in "cat". Note: Not all regular expression systems provide a case insensitivity feature and therefore the regular expression may not be portable. Checking Results only will supress display of the marked up original string and only show the results found, undoing all our helpful work, but which can make things a little less complicated especially if dealing with HTML strings or anything else with multiple < > symbols. Clear will zap all the fields - including the regular expression that you just took 6 hours to develop. Use with care. See the notes below for limitations, support and capabilities.