Problem 695. Parse string and identify specific string sequence in algebraic equation

Created by Siva

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Given a string S that defines an algebraic expression such as:

S= 'X= A1 + A2*(Y1 + A3*Y3)*exp( A4*Y12 + Y1) ;'

return a cell array {'Y1', 'Y12', 'Y123'}

i.e. parse the string S and identify the unique variables in the expression that start with the letter "Y".

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Last solution submitted on Jul 31, 2019

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Richard Zapor on 1 Jun 2012

I think the correct example solution is {'Y1', 'Y12', 'Y3'}.

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Solution 857811

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William on 28 Mar 2016

Good exercise. Two comments: 1) test case 3 has unbalanced parentheses. 2) Instruction should say that your are expecting results to be returned in sorted order, rather than the order in which they appear in the expression.

Problem 695. Parse string and identify specific string sequence in algebraic equation

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Problem 695. Parse string and identify specific string sequence in algebraic equation

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