It is not possible to set autolink_urlRegex and autolink_emailRegex properties of autolink plugin

[jswiderski]

Type of report

Bug

Provide detailed reproduction steps (if any)

1. Download CKEditor with autolink plugin.
2. Use one of below code versions to configure CKEditor:

CKEDITOR.config.autolink_urlRegex = /^(https?|ftp|file):\/\/(-\.)?([^\s\/?\.#]+\.?)+(\/[^\s]*)?[^\s\.,]$/i;
var editor = CKEDITOR.replace( 'editor1', {extraPlugins : 'autolink'});

var editor = CKEDITOR.replace( 'editor1', {
    extraPlugins : 'autolink',
    autolink_urlRegex : /^(https?|ftp|file):\/\/(-\.)?([^\s\/?\.#]+\.?)+(\/[^\s]*)?[^\s\.,]$/i
});

2. Load CKEditor and type e.g. file://C:/test/ and press space
   (I know the URL is invalid and the regex should be changed becaue it match file:///C:/test/ but this is just for simplicity of testing)

Expected result

Text should get linked.

Actual result

Text doesn't get linked

Other details

This is happening because plugin code uses e.g. CKEDITOR.config.autolink_emailRegex instead of editor.config.autolink_emailRegex:
https://github.com/ckeditor/ckeditor-dev/blob/master/plugins/autolink/plugin.js#L128
https://github.com/ckeditor/ckeditor-dev/blob/master/plugins/autolink/plugin.js#L103
https://github.com/ckeditor/ckeditor-dev/blob/master/plugins/autolink/plugin.js#L127
what makes impossible to overwrite values for these properties.

• Browser: Any
• OS: Any
• CKEditor version: 4.11.0+
• Installed CKEditor plugins: autolink

[jacekbogdanski]

Fixed in #3930