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Java - i18n equivalent for \w in regular expression (i18l word characters matching)
5 points
In this short article, we would like to show how to improve \w rule to match i18n word characters in Java.
\wis equals to[a-zA-Z_0-9]
To match i18n word characters we should use:
xxxxxxxxxx1
[\p{L}_\p{N}]
In this section, the below program iterates through text finding matched i18n characters organized in words.
On line printed in output represents a single matched word.
xxxxxxxxxx1
package com.example;2
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import java.util.regex.Matcher;4
import java.util.regex.Pattern;5
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public class Program {7
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public static void main(String[] args) {9
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Pattern pattern = Pattern.compile("[\\p{L}_\\p{N}]+"); // i18n equivalent for \w11
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String text = "日本 żółty Россия red";13
Matcher matcher = pattern.matcher(text);14
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while (matcher.find()) {16
System.out.println(matcher.group());17
}18
}19
}Output:
xxxxxxxxxx1
日本2
żółty3
Россия4
redNote: above rule can have problems with some scripts/alphabets, e.g. Hebrew.
