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Someone just like me found that it is hard to use ANTLRWorks 3.0 under Mac OS, some symbols typically vertical bar '|' is invisible . it is because default mac front is not compatible in this IDE,this is the way to fix this issue:

see answer
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  • possible duplicate of [ANTLRWorks 1.4.3 not displaying some characters such as vertical bar and open parenthesis](http://stackoverflow.com/questions/8885578/antlrworks-1-4-3-not-displaying-some-characters-such-as-vertical-bar-and-open-pa) – Bart Kiers Dec 24 '12 at 12:40

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1.click 'ANTLRWorks' in menue bar 
2.Select 'Preferences'
3.Select 'Editor'
4.you can see 'Font:' in the first line of 'Editor' page
5.Change Front , e.g I use Dialog 
6.Problem fixed.
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