How to cut the end of a string which follows a special character?

For example: 'sahdklsjf_sdfs' to 'sahdklsjf'

[Mr M.]

The following is not working for me: source = mfilename(1:end-5) Why? But this works: source = mfilename source = source(1:end-5) Why?

[David Young]

mfilename is a function, so it can't be indexed. Assigning its result to a variable then gives you a string which can be indexed.

Answer 1

[Jan]

S = 'sahdklsjf_sdfs'
Part = strtok(S, '_');

Answer 2

[Thorsten]

 regexp('sahdklsjf_sdfs', '(^[a-zA-Z]*)', 'match')

Answer 3

[Jos (10584)]

Many options, including:

str = 'sahdklsjf_sdfs'
out1 = str(1:find([str '_']=='_',1,'first'))

Also take a look at TEXTSCAN