Cont(ains balanced( nested Br(ack)ets )in t)he text
     Match succeeded

Con(tains i(mbalan(ced Br(ack)ets, )one c)lose missing
     Match succeeded

Contains i(mbalan(ced Br(ack)ets, )one op)en m)missing
     Match succeeded

No brackets in this string
     Match failed

Won)ky br(ackets in) this s(tring
     Match succeeded

More wonky br(ackets in) th)is s(tring
     Match succeeded

Just the one( leading bracket
     Match failed

And just th)e one trailing bracket
     Match failed

So(me m(ultip)le n(est(s in) thi)s o)ne
     Match succeeded

Ther(e is( mo(re) de(e)p )nes(ti(n(g i)n (mul)ti)p(l)es) he)re
     Match succeeded

Some d((oub)le b)rackets
     Match succeeded

ab(())cde
     Match succeeded

ab(c(d)e
     Match succeeded

ab(c)d)e
     Match succeeded