How to find this pattern by regular expression?

Hi,

I want to find the pattern: PATTERN that can contain lower case or
upper case characters, digits, and special characters like : _ ; ( )
& .

A sample context is:

-- Start here (this line is not in context)

PATTERN {
@ a line containing anything(comment line)
@ multiple comment lines can exist
// Another type of comments
/* Third type of comments
and it's a multiline comment
*/
x1=a AND b
y1= x1 OUTSIDE layer100
copy y1

//Comments can exist anywhere in the text (between the braces)

// this is the closing brace }

-- End here (this line is not in context)

I need when apply regular expression on the above sample context, it
return the word PATTERN.

Any guidance about the most efficient RE to perform that?

Thanks and best regards,
Ahmad
.

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