Modify dynamic input string

Question

I'm working on one requirement. I receives input string in below format.

A:82% X 18% Y B:100% X C:82% X 18% Y AB:60% X 20% Y 20% ZZ

String Explanation,

1) String consists of multiple material names like below are the material names present in above mentioned string

        A
        B
        C
        AB

2) Every material is made up of different constituents, For example A is made from 82% of X and 18% of Y. In another input string according to material name the ratio of ingredients can split accordingly. But total is always 100%

3) A string can have multiple material names and one material can be made of n number of ingredients (Total percentage would be 100%)

I want to convert my input string in below format

#A:82% X,18% Y #B:100% X #C:82% X, 18% Y #AB:60% X,20% Y,20% ZZ

I'm able to achieve hash part using regex, code snippet

String inp = "A:82% X 18% Y B:100% X C:82% X 18% Y AB:82% X 18% Y";
String regex = "(\\b[A-Za-z]{1,}\\:\\b)";   
System.out.println(inp.replaceAll(regex, "#$1"));

But am not able to handle or not getting idea for setting up commas in between ingredients of specific material.

Any suggestions please....?

Mena · Accepted Answer · 2018-02-26 15:05:16Z

1

Here's a possible solution leveraging Java 8 streams and regex.

String input = "A:82% X 18% Y B:100% X C:82% X 18% Y AB:60% X 20% Y 20% ZZ";
System.out.println(
        // streaming chunks of input delimited by start of expression
        Stream.of(
            input.split("(?=(^| )\\p{L}+:)")
        )
        // mapping each chunk to replacements
        .map(
            s ->
                // pre-pending # 
                s.replaceAll("(\\p{L}+:)", "#$1")
                // pre-pending comma for multiple value percentages
                .replaceAll("(?= \\d+% \\p{L})",",")
        )
        // collecting by trivial join
        .collect(Collectors.joining())
);

Output

#A:82% X, 18% Y #B:100% X #C:82% X, 18% Y #AB:60% X, 20% Y, 20% ZZ

edited Feb 26, 2018 at 15:05

answered Feb 26, 2018 at 14:57

Mena

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Comments

wer · Accepted Answer · 2018-03-02 12:01:22Z

0

You can use negative lookahead:

String inp = "A:82% X 18% Y B:100% X C:82% X 18% Y AB:82% X 18% Y";
String regex = "(\\b[A-Za-z]{1,}\\:\\b)";
String regexToPlaceComa = "(\\d{1,3}% [a-zA-Z]+) (?!#)";
inp = inp.replaceAll(regex, "#$1");
inp = inp.replaceAll(regexToPlaceComa, "$1,");
System.out.println(inp);

Also in your regex: "\\" character escape before ":" is redundant, and "{1,}" you can replace with "+" like below:

regex = "(\\b[A-Za-z]+:\\b)";

answered Mar 2, 2018 at 12:01

wer

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