Remove Redundant Parentheses from String Expression

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S H
S H 2016-6-7
编辑： S H 2016-6-10
String contains a long expression. Part of it is:
'...+(G0*(G1-G2+G3))+((G4*(G5+G6)))-(((G7+G8))*((G9+G10+G11)))+...'
The redundant parentheses could be removed and the expression should look like:
'...+G0*(G1-G2+G3)+G4*(G5+G6)-(G7+G8)*(G9+G10+G11)+...'
Is there a simple Matlab script to do this?
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S H
S H 2016-6-10
Thank you. I will look into https://github.com/ link.

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回答（1 个）

Image Analyst
Image Analyst 2016-6-8
Recall that Azzi answered this, or something pretty much similar, and you accepted his answer in http://www.mathworks.com/matlabcentral/answers/287777#answer_224489
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Star Strider
Star Strider 2016-6-10
@S H —
Don’t get cheeky.
Revise the documentation for the Symbolic Math Toolbox simplify function.
S H
S H 2016-6-10
编辑：S H 2016-6-10
Yes symbolic tool fixes this but it also shuffles all the terms and tries to sort them based on variable names. That is why I want to process this expression as string only.
This question takes finding matching parentheses one step further because repetition must also be accounted.
How to solve this includes the following steps:
1. write an algorithm to find matching parentheses for any existing pair
2. See if there is any pair with more than one repetition and then eliminate all redundants

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