CS 4240: Compilers and interpreters
Marta Andres Arroyo
Question I: Write regular expressions for (only *, concatenation, I and ( ) operators are allowed)
1. All unsigned integers which have nonqincreasing digits without any leading zeroes. e.
Lexical Analysis Part II
From Regular Expression
Copyright 2010, Keith D. Cooper & Linda Torczon, all rights reserved.
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Regular Expressions and
Deterministic Finite Automata
Review: How Compilers Work?
Nondeterministic Finite Automata;
RegExp = regular languages
A DFA is a five-tuple consisting of:
A set of states Q
A transition function : Q Q
One start state q0
or more accepting states F Q
A language accepted by a DFA is t