Chapter 8 Pattern Matching

Internationalization Module User’s Guide : Chapter 8 Pattern Matching

Overview

Pattern matching is the process of searching text for occurrences of a specified pattern. The Internationalization Module offers several classes that assist in finding patterns in Unicode strings:

• RWUString provides methods contains(), index(), rindex(), and subString() that search text for occurrences of a specified substring, based on simple lexical comparisons of the code units in the strings.

• RWUStringSearch performs flexible, collator-based string searches, employing the rules encapsulated by an RWUCollator and an optional RWUBreakSearch to determine if and where a match occurs.

• RWURegularExpression searches text for occurrences of a specified regular expression pattern.

• RWURegexResult stores regular expression match results.

• RWURegexMatchIterator provides a convenient interface for finding all successive matches of a particular regular expression pattern in a string.

This chapter describes the various techniques for searching Unicode text supported by the Internationalization Module:

• lexical string searching

• locale-sensitive string searching

• regular expression string searching