CODEWITHSUNDEEP
javaregex
wandermonk
wandermonk

Reputation: 7346

Replace a combination of characters using regex java

I have few string datasets in which I would like to replace a certain combination of characters using the regex replace in java. I tried multiple patterns but none of them helped. Could someone point me in the right pattern?

For example:

hello,[cicuyuv v,]imijmijm

in this string i want to replace ",[" and ",]" with a single "," wherever occured.

public class MainApp {

    public static void main(String[] args) {
        String data = "hello,[cicuyuv v,]imijmijm"
            .replaceAll("[,[\\[]]", ",");

        System.out.println(data);

    }

}

Upvotes: 1

Views: 769

Answers (2)

z atef
z atef

Reputation: 7679

System.out.println("hello,[cicuyuv v,]imijmijm".replaceAll(",(\\]|\\[)" , ","));


, matches the character , literally (case sensitive)

Capturing Group (\\]|\\[)

1st Alternative \]
\] matches the character ] literally (case sensitive)

2nd Alternative \[
\[ matches the character [ literally (case sensitive)

Upvotes: 0

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626748

Your "[,[\\[]]" represents a [,[\[]] pattern that matches a single char, either a , or a [ (the [\[] character class inside another character class formed a character class union).

You may use

String data = "hello,[cicuyuv v,]imijmijm".replaceAll(",[\\[\\]]", ",");
System.out.println(data); // -> hello,cicuyuv v,imijmijm

See the Java demo

Here, ,[\[\]] is a regex pattern that matches , and then a [ or ]. Please be very careful with ] and [ inside a character class in a Java regex: they must both be escaped (in other flavors, and when you test at regex101.com or other similar sites, [ inside [...] does not have to be escaped. It is advised to use Java regex testing sites, like RegexPlanet or Java Regular Expression Tester (no affiliation).

Upvotes: 1

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