With this example we are going to demonstrate how to check a line ending matching. We are using Patterns and Matchers against each pattern. In short, to check a line ending matching you should:
- Create a String array that contains the patterns to be used.
- For every pattern in the array compile it to a Pattern, using
compile(string regex)API method of Pattern. - Use
matcher(CharSequence input)API method of Pattern to get a Matcher that will match the given input String against this pattern. - Use
find()API method of Matcher to find the next subsequence of the input sequence that matches the pattern. - Then compile it to a Pattern, using
compile(String regex, int flags)API method of Pattern with specified pattern modes as flags. - Use
matcher(CharSequence input)API method of Pattern to get a matcher that will match the given input String against this pattern.
Let’s take a look at the code snippet that follows:
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | package com.javacodegeeks.snippets.core;import java.util.regex.Pattern;/*** Show line ending matching using RE class.*/public class LineEndings { public static void main(String[] argv) { String inputStr = "I dream of enginesnmore engines, all day long"; System.out.println("INPUT: " + inputStr); System.out.println(); String[] pattern = {"engines.more engines", "engines$"}; for (int i = 0; i < pattern.length; i++) {System.out.println("PATTERN " + pattern[i]);boolean found;Pattern pattern1l = Pattern.compile(pattern[i]);found = pattern1l.matcher(inputStr).find();System.out.println("DEFAULT match " + found);Pattern patternml = Pattern.compile(pattern[i], Pattern.DOTALL | Pattern.MULTILINE);found = patternml.matcher(inputStr).find();System.out.println("MultiLine match " + found); } }} |
Output:
INPUT: I dream of engines
more engines, all day long
PATTERN engines.more engines
DEFAULT match false
MultiLine match true
PATTERN engines$
DEFAULT match false
MultiLine match true
This was an example of how to check a line ending matching in Java.
