CODEWITHSUNDEEP
javaregex
SilentCoder
SilentCoder

Reputation: 47

Regex to extract data between words with parentheses

I have some expressions with AND, OR operators. + being AND, / being OR. I need to extract expressions within parentheses separated by operators.

Example:

Expression                    Output

(A + B)/(C + D)              (A + B),   (C + D)
(A / B)+(C / D)              (A / B),   (C / D)
(A + B / C)+(A / B)          (A + B / C),   (A / B)

Expressions can have any combination. All I need is to look at the logical operator & get data in the parentheses.

exp.split("((?<=&&)|(?=&&)|(?<=\\|\\|)|(?=\\|\\|)|(?<=\\()|(?=\\()|(?<=\\))|(?=\\)))");

But this splits on each character. I need regex to look for operators & split on that giving me data inside the parentheses as quoted in the example above. 

 If i also want the operator along with data how could it be done?

Example : 
(A + B)/(C + D)   should give me (A + B), /, (C + D)
(A + B / C)+(A / B) should give me (A + B / C), +, (A / B)

Upvotes: 1

Views: 1183

Answers (2)

SilentCoder
SilentCoder

Reputation: 47

 If i also want the operator along with data how could it be done?

    Example : 
    (A + B)/(C + D)   should give me (A + B), /, (C + D)
    (A + B / C)+(A / B) should give me (A + B / C), +, (A / B)

To do this, i hope this should work

exp.replaceAll("\\([^)]*?\\)", "")

Upvotes: 0

Alex Wittig
Alex Wittig

Reputation: 2900

I don't think you can do this with split. You could use a regex Matcher and iterate over the groups:

String input = "(A + B / C)+(A / B)";

//capture a group for each expression contained by parentheses
Pattern pattern = Pattern.compile("(\\(.*?\\))");

//create a matcher to apply the pattern to your input
Matcher matcher = pattern.matcher(input);

//find every match and add them to a list
List<String> expressions = new ArrayList<>();
while(matcher.find()) {
    expressions.add(matcher.group());
}

System.out.println(expressions);

prints [(A + B / C), (A / B)]

Upvotes: 1

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