Added regex handling
Regex tokenizer
Fixed command token generation
Refactoring to produce tags as tokens
Line error
Polishing
Added tokens list
Adapted parser
Fixed DOT bug
Added exceptions and fixed a few bugs
Navigation
Exception handling
Refactoring error function and node creation
Factory function for nodes
Error handling
Fixed subparser error
Tag filters
Listing only allowed pages
Merge branch 'lexer' into lang