Java Regular Expressions

External

• http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#sum

Internal

• java
• Regular Expressions

Overview

Regular expressions can be used in Java via the String API or java.util.regex API.

java.util.regex API

The general pattern for using regular expressions is the following:

Working code is available here:

https://github.com/NovaOrdis/playground/tree/master/java/regex/simplest

java.langString API

String s = "...";
s.matches(...);

While convenient in some cases, the String API also delegates to the java.util.regex API via the Pattern.matches() call.

Concurrent Usage Considerations

Matcher instances are NOT thread safe, create a matcher per thread