{"action":"opened","issue":{"url":"https://api.github.com/repos/gskinner/regexr/issues/326","repository_url":"https://api.github.com/repos/gskinner/regexr","labels_url":"https://api.github.com/repos/gskinner/regexr/issues/326/labels{/name}","comments_url":"https://api.github.com/repos/gskinner/regexr/issues/326/comments","events_url":"https://api.github.com/repos/gskinner/regexr/issues/326/events","html_url":"https://github.com/gskinner/regexr/issues/326","id":520079792,"node_id":"MDU6SXNzdWU1MjAwNzk3OTI=","number":326,"title":"Feature Request: Positive Lookbehind","user":{"login":"burkesuitable","id":55097152,"node_id":"MDQ6VXNlcjU1MDk3MTUy","avatar_url":"https://avatars3.githubusercontent.com/u/55097152?v=4","gravatar_id":"","url":"https://api.github.com/users/burkesuitable","html_url":"https://github.com/burkesuitable","followers_url":"https://api.github.com/users/burkesuitable/followers","following_url":"https://api.github.com/users/burkesuitable/following{/other_user}","gists_url":"https://api.github.com/users/burkesuitable/gists{/gist_id}","starred_url":"https://api.github.com/users/burkesuitable/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/burkesuitable/subscriptions","organizations_url":"https://api.github.com/users/burkesuitable/orgs","repos_url":"https://api.github.com/users/burkesuitable/repos","events_url":"https://api.github.com/users/burkesuitable/events{/privacy}","received_events_url":"https://api.github.com/users/burkesuitable/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2019-11-08T15:33:40Z","updated_at":"2019-11-08T15:33:40Z","closed_at":null,"author_association":"NONE","body":"I've been using RegExr to help me write regular expressions for quite some time. I recently wrote a regex including a feature termed \"positive lookbehind\" (written as `(?<=)`) to match CSS classes in an HTML file without matching the `class=\"\"` HTML attribute declaration details, and this feature is not currently supported by the website.\r\n\r\nYou can see that expression [here](https://regexr.com/4offk) as an example of the feature's use.\r\n[Here](https://www.regular-expressions.info/lookaround.html) is an additional resource on regex lookaraound.\r\n\r\nAnyways, I think if the positive lookahead and negative lookahead features are supported, their complements, positive lookbehind and negative lookbehind, should similarly be supported."}}
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