Regex is trimming off too many characters - sometimes

I'm trying to create a form builder that my users can use with a homegrown markup inspired by BBCode converting their questions into actual HTML

I've got a regex "fiddle" up at https://regex101.com/r/5uf7fK/1

I have two examples

Name: [TEXT|enter your name here]
Type of tenancy: [RADIO|This is a periodic tenancy,This tenancy ends on [TEXT|enter date]]

Code (markup):

and the regex I'm using is

preg_match_all("/\[([^\]]*)\]/", $block, $matches);

PHP:

So here's what I'm...

Regex is trimming off too many characters - sometimes

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