How to extract specific text from string using Regex in JAVA

Question

I have a String = '["Id","Lender","Type","Aging","Override"]'

from which I want to extract Id, Lender, Type and so on in an String array. I am trying to extract it using Regex but, the pattern is not removing the "[".

Can someone please guide me. Thanks!

Update: code I tried,

Pattern pattern = Pattern.compile("\"(.+?)\"");
Matcher matcher = pattern.matcher(str);
List<String> list = new ArrayList<String>();
while (matcher.find()) {
// System.out.println(matcher.group(1));.
list.add(matcher.group(1));

(Ps: new to Regex)

That looks like a JSON Array, so a JSON parser would be a good choice. — Andreas
– Andreas, Commented May 12, 2016 at 17:10
Using a JSON Parser is the right way to solve this, You can refer stackoverflow.com/questions/8264725/… — karthikdivi
– karthikdivi, Commented May 12, 2016 at 17:41

Sanjeev · Accepted Answer · 2016-05-12 17:37:49Z

1

You can do something like this. It first removes "[ ]" and then splits on ","

System.out.println(Arrays.toString(string.replaceAll("\\[(.*)\\]", "$1").split(",")));

Hope this helps.

answered May 12, 2016 at 17:37

Sanjeev

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Scott Weaver · Accepted Answer · 2016-05-12 18:44:51Z

1

but if your input was, say:

["Id","Lender","Ty\"pe","Aging","Override", "Override\\\\\"\""]

this regex will capture all values, while allowing those (valid) escaped quotes \" and literal backslashes \\ in your strings

regex: "((?:\\\\|\\"|[^"])+)"
or as java string: "\"((?:\\\\\\\\|\\\\\"|[^\"])+)\""

regex demo

edited May 12, 2016 at 18:44

answered May 12, 2016 at 17:16

Scott Weaver

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2 Comments

Jammy Over a year ago

It was helpful! Tnx!

Scott Weaver Over a year ago

no prob. you can go here to convert from a regex to properly escaped java string: regexplanet.com/advanced/java/index.html

Blake Yarbrough · Accepted Answer · 2016-05-12 20:15:49Z

1

Your code works, I tried it and I got the output you want.

String line = "[\"Id\",\"Lender\",\"Type\",\"Aging\",\"Override\"]";

Pattern r = Pattern.compile("\"(.+?)\"");
List<String> result = new ArrayList<>();        
// Now create matcher object.
Matcher m = r.matcher(line);
while (m.find( )) {
      result.add(m.group(1));
 } 
System.out.println(result);

output:

[Id, Lender, Type, Aging, Override]

obviously the square brackets are there because I am printing a List, they are not part of the words.

edited May 12, 2016 at 20:15

Blake Yarbrough

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answered May 12, 2016 at 18:28

Mario Cairone

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1 Comment

Jammy Over a year ago

Thanks, I corrected a small error in my code. Now it's working.

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