lexical analysis
token attribute <token,attribute>
pattern
lexemes
error recovery
input buffering
add a sentinels EOF
prefix
suffix
substring
subsequence
union
concatenation
kleene clourse L*
positive clourse L+
regular language
regular expressions
regular set (r)|(s) (r)(s) (r)* (r)
regular definition
non regular set
transition diagram
NFA
DFA
NFA->DFA->Min DFA
RE->NFA
RE->DFA
the phases of a compiler
lexical
syntax
semantic
intermediate code generator
code optimizer
code generator
symbol table
error handle
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