в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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2010-05-31T15:30:51Z

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== Displays directory listing using regular expressions ==



<source lang="java">
import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.regex.Pattern;
public class MainClass {
public static void main(String[] args) {
File path = new File(".");
String[] list;
if (args.length == 0)
list = path.list();
else
list = path.list(new DirFilter(args[0]));
Arrays.sort(list);
for (int i = 0; i < list.length; i++)
System.out.println(list[i]);
}
}
class DirFilter implements FilenameFilter {
private Pattern pattern;
public DirFilter(String regex) {
pattern = Pattern.rupile(regex);
}
public boolean accept(File dir, String name) {
return pattern.matcher(new File(name).getName()).matches();
}
}</source>



== Pattern.compile("[frb][aiu][gx]).matcher("fix the rug with bags") ==



<source lang="java">
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainClass {
public static void main(String[] args) throws Exception {
Matcher m = Pattern.rupile("[frb][aiu][gx]").matcher("fix the rug with bags");
while (m.find())
System.out.println(m.group());
m.reset("fix the rig with rags");
while (m.find())
System.out.println(m.group());
}
}
/*
*/</source>



<pre class=codeResult>fix
rug
bag
fix
rig
rag</pre>

== Pattern.compile(^java, Pattern.CASE_INSENSITIVE | Pattern.MULTILINE) ==



<source lang="java">
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainClass {
public static void main(String[] args) {
Pattern p = Pattern.rupile("^java", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
Matcher m = p.matcher("java has regex\nJava has regex\n"
+ "JAVA has pretty good regular expressions\n" + "Regular expressions are in Java");
while (m.find())
System.out.println(m.group());
}
}
/*
*/</source>



<pre class=codeResult>java
Java
JAVA</pre>

== Pattern.compile("(?m)(\\S+)\\s+((\\S+)\\s+(\\S+))$").matcher ==



<source lang="java">
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainClass {
static public final String poem = "PC Bird Cow Slow Doe Hole Joe\n"
+ "Shy Shift Sleep Do Down Doing.\n" + "Yes No How Whose\n";
public static void main(String[] args) {
Matcher m = Pattern.rupile("(?m)(\\S+)\\s+((\\S+)\\s+(\\S+))$").matcher(poem);
while (m.find()) {
for (int j = 0; j <= m.groupCount(); j++)
System.out.print("[" + m.group(j) + "]");
System.out.println();
}
}
}
/**/</source>



<pre class=codeResult>[Doe Hole Joe][Doe][Hole Joe][Hole][Joe]
[Do Down Doing.][Do][Down Doing.][Down][Doing.]
[No How Whose][No][How Whose][How][Whose]</pre>

== Pattern.compile("!!").split ==



<source lang="java">
import java.util.Arrays;
import java.util.regex.Pattern;
public class MainClass {
public static void main(String[] args) {
String input = "This!!unusual use!!of exclamation!!points";
System.out.println(Arrays.asList(Pattern.rupile("!!").split(input)));

System.out.println(Arrays.asList(Pattern.rupile("!!").split(input, 3)));
System.out.println(Arrays.asList("Aha! String has a split() built in!".split(" ")));
}
}
/**/</source>



<pre class=codeResult>[This, unusual use, of exclamation, points]
[This, unusual use, of exclamation!!points]
[Aha!, String, has, a, split(), built, in!]</pre>

== Try out regular expressions ==



<source lang="java">
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainClass {
public static void main(String[] args) {
if (args.length < 2) {
System.out.println("Usage:\n" + "java MainClass " + "characterSequence regularExpression+");
System.exit(0);
}
System.out.println("Input: \"" + args[0] + "\"");
for (int i = 1; i < args.length; i++) {
System.out.println("Regular expression: \"" + args[i] + "\"");
Pattern p = Pattern.rupile(args[i]);
Matcher m = p.matcher(args[0]);
while (m.find()) {
System.out.println("Match \"" + m.group() + "\" at positions " + m.start() + "-"
+ (m.end() - 1));
}
}
}
}</source>

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