CS 2112 Lab 7: Regular Expressions - Department of Computer Science
Regex Basics
Basic Patterns
Java
Exercise
Credit: Randall Munroe CS 2112 Lab 7: Regular Expressions
Regex Basics
Basic Patterns
Java
Exercise
CS 2112 Lab 7: Regular Expressions
October 15 / 17, 2018
CS 2112 Lab 7: Regular Expressions
Regex Basics
Basic Patterns
Java
Exercise
Regex Overview
Regular Expressions, also known as `regex' or `regexps' are a common scheme for pattern matching in strings
A regular expression is represented as a single string and defines a set of matching strings
The set of strings matched by a regex is the language of the regular expression.
CS 2112 Lab 7: Regular Expressions
Regex Basics
Basic Patterns
Java
Exercise
Regex implementations
Java supports Perl-style regular expressions through java.util.regex
The easyIO package provided with the course also supports regular expressions.
Regex terminology is incredibly variable from source to source, almost everything presented here has other names in certain contexts.
CS 2112 Lab 7: Regular Expressions
Regex Basics
Basic Patterns
Java
Exercise
The simplest regex
The simplest regular expression is just a string The regex CS2112 matches only the string "CS2112" We can add special characters to add more power.
CS 2112 Lab 7: Regular Expressions
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