Replacing strings with varying length and numbers

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Daniel Schmidt 2019-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/477455-replacing-strings-with-varying-length-and-numbers

编辑： Stephen23 2019-8-26

采纳的回答： Stephen23

I want to replace strings in varying length an numeric values.

I know that the regexprep function is very powerfull in modifying strings, but all its syntax is very complex for me.

My strings are structured like this:

'Phase1_525kV_4km_100m_0.5ohm'

Now I want to be able to replace each number and its subsequent unit up to the unterscore symbol.

So I need something that replaces all numbers in front of for exmaple km, but the length of the numeric values in front of the units are not allways the same.

This should also include values for not whole numbers like '0.5ohm' which should also be replaced completele.

What is the right syntax to use for the regexprep function?

thanks

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Stephen23 2019-8-25

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https://ww2.mathworks.cn/matlabcentral/answers/477455-replacing-strings-with-varying-length-and-numbers#answer_388939

在 MATLAB Online 中打开

>> str = 'Phase1_525kV_4km_100m_0.5ohm';
>> out = regexprep(str,'\d+\.?\d*[a-zA-Z]+','X')
out = Phase1_X_X_X_X

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Daniel Schmidt 2019-8-25

Wow, very nice.

But what if I just want to replace one variable?

When I specifiy the unit 'm' that it replaces just the '100m'.

And if I choose 'ohm' that it replaces '0..5oohm'.

Is that possible.

Stephen23 2019-8-26

编辑：Stephen23 2019-8-26

在 MATLAB Online 中打开

"But what if I just want to replace one variable?"

You can specify the unit:

>> str = 'Phase1_525kV_4km_100m_0.5ohm';
>> regexprep(str,'\d+\.?\d*m','X') % replace meters
ans = Phase1_525kV_4km_X_0.5ohm
>> regexprep(str,'\d+\.?\d*ohm','X') % replace ohms
ans = Phase1_525kV_4km_100m_X

Note that for robustness this should be the complete suffix+unit, followed by a lookaround assertion that checks if the following character is '_' or the end of the string, other 'm' can be ambiguously interpreted.

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