Unknown regexp modifier "/g" at 1645_SoPW.pl line 18, near "= "

##</code><code>##

Bareword found where operator expected at 1645_SoPW.pl line 18, near "qr{ (\w+) }gx"
syntax error at 1645_SoPW.pl line 18, near "qr{ (\w+) }gx"