MATLAB: How to search for a string in a text file that has carriage returns within the string

MATLABstrfind strrep return \n

I have a text file I am trying to locate strings. Lets say that the txt file looked like this:

'hello

world'

When I search for the string 'hello world' the above txt file would yield 0 results. How can I go about getting a result for this instead of it being overlooked?

Thank you for the help. Will

Best Answer

str = regexprep(str,'\r\n|\n|\r',' ') or strtrim to remove formatting from the string and THEN doing a string search solves this issue

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MATLAB: Check two string data without carriage return symbol

Why not just take the first row?

I.e.

Psvoltage =  deblank(fscanf(obj1)) %, '%d', 4)
if ( ~isempty(Psvoltage) ) 
  Psvoltage = Psvoltage(1,:);
end

edit: added ~isempty check

MATLAB: How to remove leading and trailing spaces from a string

To remove leading and trailing spaces from the string, you can use the DEBLANK function:

str = '   Hello, World!   '
str = deblank(str)  %remove trailing spaces
str_flipped = str(end:-1:1)  %flip the string
str_flipped = deblank(str_flipped)  %remove trailing spaces of the flipped string
str = str_flipped(end:-1:1)  %flip the string back

The resulting string does not contain any leading or trailing spaces:

str
 str = 'Hello, World!'

To remove leading spaces from the string, you can also use the STRTOK function, which finds the first token in the string. (A token is the first set of characters that is encountered before a delimiter. In the following example, it is white space.) Leading delimiters are ignored. For example:

str = '   Hello   '
str_new = strtok(str)

The first token of the string 'str' without any leading spaces is found:

str_new
 str_new = 'Hello'

If you have a string containing more than one token and want to remove leading spaces from the string, you can use STRTOK in the following format:

 [token,rem] = strtok(str)

where 'str' is the input string, 'token' is the first token, and 'rem' is the remainder. Then combine the outputs 'token' and 'rem'.

For example:

str = '   Hello, World!'
[t,r] = strtok(str)
str_new = [t r]

Here is the output:

 t = 'Hello,'
 r = ' World!'
 str_new = 'Hello, World!'

For more information on these functions, type 'help function_name' at the MATLAB command prompt. If you have installed the documentation, type 'doc function_name' to see the documentation for these functions. If you do not have the documentation installed, you can find it here:

http://www.mathworks.com/access/helpdesk/help/techdoc/matlab.shtml

Simply type the function name in the search box.

Best Answer

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MATLAB: Check two string data without carriage return symbol

MATLAB: How to remove leading and trailing spaces from a string

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