This MATLAB function returns the starting index of each substring of str that matches the character patterns specified by the regular expression.
Regex symbol to match at beginning of a line: ^ Add the string you're searching for (CTR) to the regex like this: ^CTR Example: regex That should be enough! However, if you need to get the text from the whole line in your language of choice, add a "match anything" pattern .: ^CTR. Example: more regex If you want to get crazy, use the end of line matcher $ Add that to the growing regex ...