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An example of a regular expression search program |
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This Java tip illustrates an example of a quintessential regular expression search
program. Developer may use this code to search for matches in a string by using
a regular expression.
import java.util.regex.*;
public class BasicMatch {
public static void main(String[] args) {
// Compile a regular expression
String patternStr = "b";
Pattern pattern = Pattern.compile(patternStr);
// Check for the existence of the pattern
CharSequence inputStr = "a b c b";
Matcher matcher = pattern.matcher(inputStr);
boolean matchFound = matcher.find(); // true
// Retrieve matching string
String match = matcher.group(); // b
// Retrieve indices of matching string
int start = matcher.start(); // 2
int end = matcher.end(); // 3
// the end is index of the last matching character + 1
// Find the next occurrence
matchFound = matcher.find(); // true
}
}
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