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.

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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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