case insensitive strfind?

I have a matrix in which there are about 100,000 sentences that I want to scan for the existence of certain words (True/false). For previous scans, searching for one exact word, I used the strfind. Nevertheless, now I have a list of 18 words which might be written in lower or upper cases in the sequences. The strcmpi which could be useful in this case only returns positive if the whole sentence consist of the word... Is there another function I missed?

Thank you

Answer 1

[Titus Edelhofer]

Hi,

one simple method would be to use lower on both the sentences and the words you are using ...

Titus

[Tord Bjørnevaagen]

I just used this solution, thanks!

strfind(lower(bigText),lower(keyword))

Answer 2

[Fangjun Jiang]

use regexpi

[Turner]

takes 10 times longer than lower/upper followed by strfind() in my benchmark

Answer 3

[Bjorn Gustavsson]

Use: strcmpi

[Walter Roberson]

strcmpi() is not suitable for substring searches. See http://www.mathworks.com/help/techdoc/ref/strcmpi.html about what it _does_ do.

[Bjorn Gustavsson]

I misread the original poster's strfind as strcmp...