How to replace string but not function

Question

Ravi Goyal 2016-10-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/307923-how-to-replace-string-but-not-function

评论： Ravi Goyal 2016-10-21

采纳的回答： Sean de Wolski

Dear Community,

In a string like: 'sinh(x).*f.*n'

I want to replace the n with X_Model(1). Using strrep however I end up with

siX_Model(1)h.*f.*X_Model(1)

which means that the n in sinh was also found to be an n and replaced. How can I make it exclusiv, so only if it matches exactly the replacement does take place? In a Matlab Script using 'Find and Replace' I can make this happen when I click 'Match Case' and 'Whole Word', so I want to have this functionality in a function.

Thanks and best Regards Ravi

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Answer 1

Sean de Wolski 2016-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/307923-how-to-replace-string-but-not-function#answer_239598

编辑：Sean de Wolski 2016-10-18

在 MATLAB Online 中打开

This can be done elegantly and safely with Symbolic Math Toolbox

syms x f n model(ix)
expr = sinh(x).*f.*n
subs(expr,n,model(1))

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Ravi Goyal 2016-10-19

Thanks Sean,

Would you know of any way not using the Symbolic Math Toolbox? Best Regards Ravi

Sean de Wolski 2016-10-19

Not a safe way that is completely fool proof.

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Answer 2

Jan 2016-10-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/307923-how-to-replace-string-but-not-function#answer_239714

编辑：Jan 2016-10-19

在 MATLAB Online 中打开

Str  = 'sinh(x).*f.*n'
Str2 = regexprep(Str, '\bn\b'

I cannot test this currently.

[EDITED]

Str2 = regexprep(Str, '(?:^|\W)n(?:$|\W)', 'X_Model(1)')

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Jan 2016-10-19

编辑：Jan 2016-10-19

@Ravi: See [EDITED] Please test this exhaustively, because I'm not a regexp hero.

Ravi Goyal 2016-10-21

Thanks Jan,

It does the job for the n but then fails for the normal replacement of x in sinh(x) by getting rid of the brackets...I guess i gotta go somehow with the symbolic toolbox or just leave it a known bug.

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