Skim the clipboard

About

This add-on use  regular expression templates to filter a text when it is pasted or copied.
You may paste & filter when you paste a text modified by a regular expression in a form field in the browser. 
You may copy & filter to copy some text from a web page and want to use it modified by a regular expression in another application.
You may also apply a regular expression modifier to change a text already in the clipcoard. The changed text being kept in the clipboard so that it can be pasted in the address bar for example.

Example 1: Suppose I want to filter only words that are longer then four characters to use in search engine:
Open the Skim the clipboard option page click on Add a row (check box field) and enter the following in the table: 

- set name: >4, 
- set regular expression template: [\w\u00c0-\u010f]{4,}
- Regular expression modifier: gi
- set keep match or substitute: checked
- Keep in clipboard: unchecked
- Shortcut: two

Click on Save all and close the option page.

Close the options, and select and copy a text from the web page you want to search, click in the search engine field, right click and select 
Paste  filtered - >4. Only the words of four charaters or more are paste in the field.
You may also  simply press Ctrl+Shift+B (PC) / Command+Shift+B (Mac) in the form field to paste the modified clipboard content.

Example 2: Suppose I want to paste the host url address (https://dev.opera.com/) in the address bar, using any link location from this site, eg. (https://dev.opera.com/extensions/publishing-guidelines/#create).

Open the Skim the clipboard option page, click on Add a row (text field) and enter the following in the table: 

- set name: host, 
- set regular expression template: (^http.?:\/\/[^\/]+)(.*$)
- Regular expression modifier: gi
- set keep match or substitute: $1
- Keep in clipboard: checked
- Shortcut: one

Click on Save all and close the option page.
Copy a page url from the address bar or on the context menu Copy link Address. Click on the page and right click on Replace in Clipboard > Host. The clipboard content is changed to the host url.Click in the address bar and (regular) paste the modified url that you can paste in the address bar.
You may also  simply press Ctrl+Shift+A (PC) Command+Shift+A (Mac) in the web page to modify the clipboard content.