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

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pietro 2017 年 6 月 12 日
コメント済み: pietro 2017 年 6 月 13 日
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?
  3 件のコメント
Stephen23 2017 年 6 月 12 日
@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:



Adam 2017 年 6 月 12 日
編集済み: Adam 2017 年 6 月 12 日
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.
  1 件のコメント
pietro 2017 年 6 月 13 日
ahh you're right! Thanks


その他の回答 (1 件)

Walter Roberson
Walter Roberson 2017 年 6 月 12 日
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.
  1 件のコメント
Walter Roberson
Walter Roberson 2017 年 6 月 12 日
regexptranslate() with the 'escape' option is suitable for this purpose.




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