MATLAB Programming

3 Basic Program Components
Operator
$
${cmd}
Usage
The string represented by the token
identified by name
The string returned when MATLAB
executes the command cmd
You can capture parts of the input string as tokens and then reuse them in
the replacement string. Specify the parts of the string to capture using the
token capture operator (...). Specify the tokens to use in the replacement
string using the operators $1, $2, $N to reference the first, second, and Nth
tokens captured. (See the section on “Tokens” on page 3-48 and the example
“Using Tokens in a Replacement String” on page 3-53 in this documentation
for information on using tokens.)
Note When referring to a token within a replacement string, use the number
of the token preceded by a dollar sign. For example, refer to token 2 by using
$2, and not 2 or \2.
The following example uses both the ${cmd} and $N operators in the
replacement strings of nested regexprep commands to capitalize the first
letter of each sentence. The inner regexprep looks for the start of the entire
string and capitalizes the single instance; the outer regexprep looks for the
first letter following a period and capitalizes the two instances:
s1 = 'here are a few sentences.';
s2 = 'none are capitalized.';
s3 = 'let''s change that.';
str = [s1 ' ' s2 ' ' s3]
regexprep(regexprep(str, '(^.)', '${upper($1)}'), ...
'(?