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2010-06-01T06:00:50Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:43Z

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== Greedy and Nongreedy Matching in a Regular Expression ==



<source lang="java">

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] argv) throws Exception {
// Greedy quantifiers
String match = find("A.*c", "AbcAbc");
match = find("A.+", "AbcAbc");
}
public static String find(String patternStr, CharSequence input) {
Pattern pattern = Pattern.rupile(patternStr);
Matcher matcher = pattern.matcher(input);
if (matcher.find()) {
return matcher.group();
}
return null;
}
}
</source>



== Greedy Qualifier ==



<source lang="java">

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String args[]) {
String regex = "(\\w+)(\\d\\d)(\\w+)";
Pattern pattern = Pattern.rupile(regex);
String candidate = "X99 asdf 44";
Matcher matcher = pattern.matcher(candidate);
matcher.find();
System.out.println(matcher.group(1));
System.out.println(matcher.group(2));
System.out.println(matcher.group(3));
}
}
</source>



== Nongreedy quantifiers ==



<source lang="java">

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] argv) throws Exception {
// Nongreedy quantifiers
String match = find("A.*?c", "AbcAbc");
match = find("A.+?", "AbcAbc");
}
public static String find(String patternStr, CharSequence input) {
Pattern pattern = Pattern.rupile(patternStr);
Matcher matcher = pattern.matcher(input);
if (matcher.find()) {
return matcher.group();
}
return null;
}
}
</source>



== Reluctant Qualifier Example ==



<source lang="java">

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String args[]) {
String regex = "(\\d+?)";
Pattern pattern = Pattern.rupile(regex);
String candidate = "1234";
Matcher matcher = pattern.matcher(candidate);
while (matcher.find()) {
System.out.println(matcher.group());
}
System.out.println("Done");
}
}
</source>

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Java/Regular Expressions/Greedy - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010