Problem 80. Test for balanced parentheses

Created by Cody Team

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Given the input inStr, give the boolean output out indicating whether all the parentheses are balanced.

Examples:

If inStr is '(()', the output is false.
If inStr is '(xyz)(ab)' the output is true.
If inStr is ')(', the output is false.

The string may include characters other than ( and ), but you should ignore them.

Incidentally, this problem was inspired from the Rosetta Code site. Why not create a few problems of your own by poking around the tasks at Rosetta Code?

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Solution Stats

1920 Solutions
740 Solvers

Last Solution submitted on Jan 22, 2020

Last 200 Solutions

Problem Comments

1 Comment

1 Comment

Sanzhar Askaruly on 13 Jul 2019

can be solved without 'regexp'

Solution Comments

Solution 1984616

1 Comment

1 Comment

Simon Thomas on 21 Oct 2019

A slightly more robust test might include a balanced equation starting with something other than an opening bracket.
Test 3 might be
inStr = '3*(z*(a-(x+3))/(y))';

Solution 301402

1 Comment

1 Comment

Dajun on 11 Aug 2013

Wrong solution.

Solution 286236

2 Comments

2 Comments

Jan Orwat on 20 Jul 2013

it doesn't work in some cases not included in test suite. for example:
inStr = '(z*(a-(x+3))/(y)*z)';

danteliujie on 11 Mar 2019

Nice solution

Solution 117266

1 Comment

1 Comment

Khaled Hamed on 28 Jul 2012

Seems to fail for inStr='(' , '((', etc.

Solution 63021

1 Comment

1 Comment

Mathias on 19 Mar 2012

I admit this is cheating, but I think it also stresses the need for more tests in the suite. Also, not all the cases should necessarily be visible, so you can't adapt a solution like this.

Solution 32192

1 Comment

1 Comment

Mathias on 19 Mar 2012

This solution fails for the input ')()', i.e. it returns true when it should return false.

Solution 31038

1 Comment

1 Comment

Mathias on 19 Mar 2012

This solution fails for the input '(()', i.e. it returns true when it should return false.

Solution 9066

1 Comment

1 Comment

Mathias on 19 Mar 2012

This solution fails for the input '(()', i.e. it returns true when it should return false.

Solution 2131

1 Comment

1 Comment

Yuval Cohen on 26 Jan 2012

This entry is incorrect. It fails the simple case of:
isBalanced('(')

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Problem 80. Test for balanced parentheses

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Problem 80. Test for balanced parentheses

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Last 200 Solutions

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Problem Recent Solvers740

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