[BBCode] Source of URL native BBCode (3.0.2)

[Desiderius]

Hello World,

New at BBCodes, I would like to create a BBCode similar to the native URL BBCode in phpBB 3.0.2.
But this code would allow a link to be opened in a new tab of the browser.

I did this:
BBCode

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[exturl]{URL}[/exturl]

HTML code W3C compliant

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<a href="{URL}" onclick="window.open(this.href); return false;">{URL}</a>

Help Line

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[exturl]enter here URL link to be opened in a new page[/exturl]

And all this works perfectly well.

Now, if I wish to add the alternate syntax

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[exturl={URL}]{SIMPLETEXT}[/exturl]

I do not succeed to make it work.

Any clues, anyone?
The source of the native URL BBCode could help.

Thanks and a

HAPPY NEW YEAR