How to Capture this up by CSS and regex (_Token)

[jehadfatooh100]

Both ways don’t work I think why
How to solve this subject

name="_Token[fields]" autocomplete="off" value="bb799e9377024b28e52e39f78354f03397f9c6be%3A" 

[girolamotancredi]

Use this regex:

name="_Token\[fields\]"\sautocomplete=".+?"\svalue="(.+?)"