Split a text with regex in Java

Question

I need to get a text splitted with regex in Java (each substring will be less than or close to 10 characters (including space and special) and no word would be splitted). For example, "James has gone out for a meal." would be "James has", "gone out", "for a meal", ".". Thanks in advance.

I've tried Splitter in Guava like Splitter.on(regexp).trimResults().split(text). For regexp I've used something like "(\W|^)[\w.]{0,10} (\W|$)". I guess it is logically incorrect. — user11372017, May 29 '19 at 03:59
You can derive some inspiration from: https://stackoverflow.com/q/4398270/9192223 — hiren, May 29 '19 at 04:00
You have to determine an end for your parts of substrings. If we determine . and space as separators, then you can use this pattern. (.{0,10})(?:\s|\.) https://regex101.com/r/I1nrb6/1 — Hamed Ghasempour, May 29 '19 at 04:02
@hiren thanks, a lot of possible ways to solve the problem. But I'd like to use regex . — user11372017, May 29 '19 at 04:03

Emma · Accepted Answer · 2019-05-29T04:11:32.007

This expression might be a little complicated, maybe we could start with:

.{1,10}[^\s](?=\s|$)

DEMO

import java.util.regex.Matcher;
import java.util.regex.Pattern;

final String regex = ".{1,10}[^\\s](?=\\s|$)";
final String string = "James has gone out for a meal.";

final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);

while (matcher.find()) {
    System.out.println("Full match: " + matcher.group(0));
    for (int i = 1; i <= matcher.groupCount(); i++) {
        System.out.println("Group " + i + ": " + matcher.group(i));
    }
}

RegEx Circuit

jex.im visualizes regular expressions:

score 1 · Answer 2 · answered May 29 '19 at 04:05

1

First, remove all double spaces if exists and apply this regex.

.{1,11}(?:\s|$)|.{1,11}(?:[^\s]|$)

But I would use the split function and then 'for clause' calculating lengths.

answered May 29 '19 at 04:05

Kang Andrew

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Split a text with regex in Java

2 Answers2

DEMO

RegEx Circuit