Escaped round bracket followed by a space does not allow matches after the space

[jmbragg]

From an email discussion with Tim and Phil:

Round brackets can be escaped so the correct syntax is

match(Pb²⁺(aq) + 2Cl^-(aq) = PbCl₂(s))

but it seems that the algorithm cannot cope with ')' being followed by space (which is a word terminator as defined in pattern match where a word is a sequence of characters between spaces). So match(Pb²⁺(aq)) works but as soon as you go beyond this you hit the bug.