CODEWITHSUNDEEP
javaandroidregex
JoeyCK
JoeyCK

Reputation: 1402

Android split string with regex not working

I'm trying to split a string at every "." or "?" and I use this regular expression:

(?<=(?!.[0-9])[?.])

In theory the code also prevents splitting if the point is followed by a number so things like 3.000 are not split and it also includes the point in the new string.

For example if I have this text: "Hello. What's your favourite number? It's 3.560." I want to get thi: "Hello.","What's your favourite number?","It's 3.560."

I've made a simple java program on my computer and it works exactly like I want:

String[] x = c.split("(?<=(?!.[0-9])[?.])");
for(String v : x){
    System.out.println(v);
}

However when I use this same regex in my Android app it doesn't split anything...

x = txt.split("(?<=(?!.[0-9])[?.])");
//This, in my android app, returns an array with only one entry which is the whole string without splitting.

PS. Using (?<=[?.]) works so the problem must be in the (?!.[0-9]) part which is meant to exclude points followed by a number.

Upvotes: 1

Views: 3259

Answers (3)

Sri Harsha Chilakapati
Sri Harsha Chilakapati

Reputation: 11940

Try this.

public class Tester {

    public static void main(String[] args){
        String regex = "[?.][^\\d]";
        String tester = "Testing 3.015 dsd . sd ? sds";
        String[] arr = tester.split(regex);
        for (String s : arr){
            System.out.println(s);
        }
    }

}

Output:

Testing 3.015 dsd 
sd 
sds

Upvotes: 1

Ωmega
Ωmega

Reputation: 43663

Use regex pattern

(?:(?<=[.])(?![0-9])|(?<=[?]))

str.split("(?:(?<=[.])(?![0-9])|(?<=[?]))");

Upvotes: 4

Ian Roberts
Ian Roberts

Reputation: 122364

Remember that outside a square bracket character class, . in a regular expression means any single character. You need \. to match a literal dot, which in turn means you need \\. in the string literal.

Upvotes: 2

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