Mehran Habibi's Java Regular Expressions: Taming the java.util.regex Engine PDF


By Mehran Habibi

ISBN-10: 1590591070

ISBN-13: 9781590591079

This can be the single booklet to exploit the Java library to technique commonplace expressions. It is beautiful since it has such a lot of examples. general expressions books should not rather a lot "studied" as they're "looked via" and mined for reliable strategies. for instance, the correct regex expression can exchange a whole web page of code with strains. Java/J2SE 1.4 provides a library for dealing with commonplace expressions. typical expressions are textual content expressions used to discover bits of knowledge in higher bits of textual content, like 'find me all sentences with the note John' in it, or does any dossier comprise '5 e's'... The author offers a glance at what standard expressions are and the way to take advantage of the Java library to method average expressions.  there are many examples to teach commonplace and peculiar makes use of of the library, a strong studying software.

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Additional resources for Java Regular Expressions: Taming the java.util.regex Engine

Example text

The code in Listing 1-11 takes a sentence and attempts to strengthen it by placing the positives and negatives in opposition. Output 1-11 shows the result. java public class StyleSplitExample{ public static void main(String args[]){ String phrase1= "but simple justice, not charity"; strengthenSentence(phrase1); String phrase2= "but that I love Rome more, not that I love Caesar less"; strengthenSentence(phrase2); String phrase3= "ask what you can do for your country, ask not what your " + "country can do for you"; strengthenSentence(phrase3); } /** * Splits and rearranges the given String, hopefully to a more * powerful effect.

Search and Replace One of the most powerful features of the new regex package is the ability to search for and replace Strings and substrings. substring methods, along with a lot of String arithmetic. Thankfully, those days are over. There are two general ways to do search and replace operations in J2SE. The following example travels the easier path by taking advantage of two new methods added to the String class. 2007 00:40:20] Regular Expression Operations ● replaceAll(String regex,String replacement) The first method, replaceFirst(String regex, String replacement), simply replaces the first occurrence of the regex pattern with the replacement String.

As such, it makes sense to put Java's regex support in context by comparing it to that of Perl. The distinctions you should be aware of are highlighted in the sections that follow. Generally speaking, J2SE doesn't include some Perl constructs, because Java is a full-featured programming language that offers sophisticated condition and logical paths of execution that are reasonable alternatives to the constructs offered by Perl. What Perl Offers That Java Regex Doesn't There are several constructs and concepts you might be familiar with from your Perl experience that you won't be able to use in the current implementation of Java.

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Java Regular Expressions: Taming the java.util.regex Engine by Mehran Habibi

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