Search in String

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8

I have a String of dynamic size and I need to search for the "#" cross to the next blank.

I tried to use split, but without success. 

String texto = "oi tudo bem como vai #01?";
String[] t ;
t = texto.split(texto);
java string
  • 1

    You want to capture the text #01??

  • Are you sure you just want to find it? I ask because if you want to create a text replacement mechanism to put on screens, reports, etc., it would be better not to reinvent the wheel, because there are several excellent mechanisms for this.

  • Voce must use regex the documentation is very simple https://docs.oracle.com/javase/tutorial/essential/regex/ and this site has great tutorials and examples http://www.regular-expressions.info/

3 answers

8


An example of how to separate snippets starting with # and even find a blank:

import java.util.regex.*;

class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        String texto = "oi tudo bem como vai #1234a #sdf #$%¨#@)~";
        Pattern p = Pattern.compile("#\\S+");
        Matcher m = p.matcher(texto);
        while(m.find()) {
            System.out.println(m.group(0));
        }
    }
}

Upshot:

#1234a
#sdf
#$%¨#@)~

See working on Ideone

5

You can try with regex

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

final String regex = "[#]\\w*\\d*\\W\\s*";
final String string = "oi tudo bem como vai #01?";

final Pattern pattern = Pattern.compile(regex);
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));
    }
}

Functioning in the Ideone

2

You can do it like this:

String cantadaHorrivel = "oi tudo bem como vai #01?";
String[] primeiroSplit = cantadaHorrivel.split("#");
String[] segundoSplit = primeiroSplit[1].split(" ");
String texto = segundoSplit[0];

This will fail if the original input is not seared, so be sure to treat that as well.

  • You could at least check primeiroSplit.length() to deal with the common case; it would be even better to create a List<String> to contain instances of terms introduced by wire fence. It costs no more than three more lines...

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