Why do strfind and regexp may lead to a different result?

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pietro
pietro 2017-6-12
评论： pietro 2017-6-13
Hi all,
I noticed that regexp and strfind may lead to different results. Here an example:
regexp('Infinitely Variable Transmission (IVT)','Infinitely Variable Transmission (IVT)')
Why does it occur?
Thanks
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Stephen23
Stephen23 2017-6-12
编辑：Stephen23 2017-6-12
@pietro: if you are planning on using regular expressions then you really need to understand the different meta-characters, such as parentheses. A good place to learn about regular expressions in MATLAB is to read the MATLAB documentation:
https://www.mathworks.com/help/matlab/matlab_prog/regular-expressions.html

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Adam
Adam 2017-6-12
编辑：Adam 2017-6-12
regexp( 'Infinitely Variable Transmission (IVT)', 'Infinitely Variable Transmission \(IVT\)' )
works, but you have to escape the parenthesis as they have special meaning in a regexp expression.
if you look in
doc regexp
in the section headed 'Split Text at Delimiter Using split Keyword', there is an example of this for escaping the ^ symbol.

更多回答（1 个）

Walter Roberson
Walter Roberson 2017-6-12
In the general case, regexp can return different results if the pattern includes metacharacters.
There is a routine that can be used to "escape" characters so that they are treated literally, but the routine name is not coming to mind at the moment.

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