Using method replaceall of String in Java

Question

I want to get from a string only the character: +,-,/,x
But this says - is a redundant character range.

String operacoes=texto.replaceAll("[^+?-?/?x]+"," ");

How can i make this work?

it could be for example: 3 + 5 - 2 / 4 x 5. And after that operacoes will be: + - / x with spaces between. — Nmaster88
– Nmaster88, Commented Apr 16, 2015 at 14:31
I'll give another example because i think you're mistaking. If texto=3 + 4 - 5 + 4. Then operacoes will be + - + — Nmaster88
– Nmaster88, Commented Apr 16, 2015 at 14:35

Md. Nasir Uddin Bhuiyan · Accepted Answer · 2015-04-16 14:46:30Z

1

Just add \\ before - character. Because - character used in regex in various ways like [A-Z] [0- 9] etc. So to identify - you need to put \\ in java because single \ doesn't support in string in java.

    String texto="3 + 4 - 5 + 4";
    String operacoes=texto.replaceAll("[^+?\\-?/?x]+"," ");
    System.out.println(""+operacoes);

edited Apr 16, 2015 at 14:46

answered Apr 16, 2015 at 14:37

Md. Nasir Uddin Bhuiyan

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Justin L · Accepted Answer · 2015-04-16 14:39:01Z

0

String texto = "1+2-3/4x5";
String operacoes=texto.replaceAll("[^+?\\-?/?x]+"," ");
System.out.println(operacoes);

Produces the output

+ - / x

answered Apr 16, 2015 at 14:39

Justin L

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qcGold · Accepted Answer · 2015-04-16 14:42:55Z

0

You have to escape the minus sign using double backslash.

String operacoes=texto.replaceAll("[^+?\\-?/?x]+"," ");

Since the character - is used in regex

edited Apr 16, 2015 at 14:42

answered Apr 16, 2015 at 14:34

qcGold

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