45 lines
1.3 KiB
Java
45 lines
1.3 KiB
Java
// strings/TestRegularExpression.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Simple regular expression demonstration
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// {java TestRegularExpression
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// abcabcabcdefabc "abc+" "(abc)+" }
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import java.util.regex.*;
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public class TestRegularExpression {
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public static void main(String[] args) {
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if(args.length < 2) {
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System.out.println(
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"Usage:\njava TestRegularExpression " +
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"characterSequence regularExpression+");
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System.exit(0);
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}
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System.out.println("Input: \"" + args[0] + "\"");
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for(String arg : args) {
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System.out.println(
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"Regular expression: \"" + arg + "\"");
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Pattern p = Pattern.compile(arg);
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Matcher m = p.matcher(args[0]);
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while(m.find()) {
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System.out.println(
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"Match \"" + m.group() + "\" at positions " +
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m.start() + "-" + (m.end() - 1));
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}
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}
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}
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}
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/* Output:
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Input: "abcabcabcdefabc"
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Regular expression: "abcabcabcdefabc"
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Match "abcabcabcdefabc" at positions 0-14
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Regular expression: "abc+"
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Match "abc" at positions 0-2
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Match "abc" at positions 3-5
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Match "abc" at positions 6-8
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Match "abc" at positions 12-14
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Regular expression: "(abc)+"
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Match "abcabcabc" at positions 0-8
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Match "abc" at positions 12-14
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*/
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