Wanting to isolate a number from a string

hi,

I have a struct with a list of filenames which I want to extract a piece of data from, the filename is in the format

ZYXW1_4.0kHz_1_P.tif

or

ZYXW1_26.0kHz_1_P.tif

All I wish to be left with is

4.0_1
or
(4.0,1)

So that I can write those digits onto an image.I have used strep and regex to isolate pieces of data in the past from a string but have not been able to figure out how to isolate data before an expression such as kHz etc.

I have

str=('ZYXW1_4.0kHz_1_P.tif')
expression = '\d*\.\dkHz';
matchStr = regexp(str,expression,'match')

but it won't give me the "_1".

Any ideas?

Answer 1

[Stephen23]

>> str = 'ZYXW1_4.0kHz_1_P.tif';
>> regexprep(str,'^.*_(\d+\.?\d*)\D+_(\d+)_\D+$','($1,$2)')
ans = (4.0,1)

[Stephen Devlin]

I just came up with

str=('ZYXW1_26.0kHz_1_P.tif')
expression = '\d*\.\dkHz\w\d*';
matchStr = regexp(str,expression,'match')
text_out=strrep(matchStr,'kHz','')

But I'll accept this because its better, thank you Stephen