从字符串中提取变量和值

Question

I have a string that looks like this: String info = "var1=value1;var2=value2;var3=value3;" ;

What would be your approach to extract each var name and value in Java?

Any ideas would be appreciated,

Thanks!

Answer 1

You can try using following regex,

(\w+)=(\w+);

Working Demo

It uses the concept of Group capture

Answer 2

Another user asked a similar question. The user wanted to know how to parse a string "A=B&C=D&E=F" into a map. Your string looks almost the same. It got keys and values too.

Using a map would be the easiest way to have a clear structure. Take a look at the following question and the provided answer:

How to parse the string into map

Extracted part of the answer:

I would use split

 String text = "A=B&C=D&E=F"; Map<String, String> map = new LinkedHashMap<String, String>(); for(String keyValue : text.split(" *& *")) { String[] pairs = keyValue.split(" *= *", 2); map.put(pairs[0], pairs.length == 1 ? "" : pairs[1]); } 

EDIT allows for padded spaces and a value with an = or no value. eg

A = minus- & C=equals= & E==F

It shows how you could split a string like yours in key-value pairs and save those in a map.

This would be my choice to split your string and storage the information.

Answer 3

I would probably just go with String.split() (untested):

for (String s : info.split(":") {
     String[] pair = s.split("=");
     HashMap.put(pair[0],pair[1]);     // Or whatever you do with the data
}

Answer 4

Thanks for helping me out with this. I have read about regex and I'm more familiar with it now. I admit I should go through the tutorials first before I asked the question (lesson learned). I was bit under pressure so that was easier was just ask someone :)
I have used the method suggested Hudi:

    public class ArduinoResponsePhraser {


        Map varMap = new HashMap();

        public Map PhraseString(String response)
        {
                for (String s : response.split(";")) {
                        String[] pair = s.split("=");
                        varMap.put(pair[0], pair[1]);
                }
                return varMap;
        }