I have a texteare where someone can input text. I do not want a wysiwyg editor.

But what would be great:

Strip all tags, but make correct <p> and <br /> if user input has new lines. Additionally convert all urls, with or without http// or parameter to clickable links.

I cannot find a solution.

So you could type into the textarea:

........
This is a paragraph
This ist still in the paragraph

this is a new paragraph www.this-would-be-clickable

new paragraphp `<strong>`this will be shown not bold`</strong>`
........

thankfull for every advice