Parsing errors on word boundaries

Nothing serious, but an incompatibility with the Choate parser, the drupal parser mis-reads Textile that does not have space boundaries where Brad's parser requires only word-boundaries:

e.g at the end of the teaser<!-- break -->!graphic.gif! 

the image markup exclamation point is missed unless it starts the line or is preceded by whitespace; I've noticed a few other places where parsing differs for the same basic reason, perhaps a difference between regex marked by \s instead of \b?