MATLAB Programming

Regular Expressions
starting match: [^abcdefghij]
starting match: [a^bcdefghij]
starting match: [ab^cdefghij]
starting match: [abc^defghij]
starting match: [abcd^efghij]
starting match: [abcde^fghij]
starting match: [abcdef^ghij]
Dynamic Operators for the Replacement Expression
The three types of dynamic expressions discussed above can be used only
in the match expression (second input) argument of the regular expression
functions. MATLAB provides one more type of dynamic expression; this one
is for use in a replacement string (third input) argument of the regexprep
function.
Dynamic Commands that Modify the Replacement Expression —
${cmd}. The ${cmd} operator modifies the contents of a regular expression
replacement string, making this string adaptable to parameters in the
input string that might vary from one use to the next. As with the other
dynamic expressions used in MATLAB, you can include any number of these
expressions within the overall replacement expression.
In the regexprep call shown here, the replacement string is
'${convert($1,$2)}'. In this case, the entire replacement string is a
dynamic expression:
regexprep('This highway is 125 miles long', ...
'(\d+\.?\d*)\W(\w+)', '${convert($1,$2)}')
The dynamic expression tells MATLAB to execute an M-file function named
convert using the two tokens (\d+\.?\d*) and (\w+), derived from the
string being matched, as input arguments in the call to convert. The
replacement string requires a dynamic expression because the values of $1
and $2 are generated at runtime.
The following example defines the M-file named convert that converts
measurements from imperial units to metric. To convert values from the
string being parsed, regexprep calls the convert function, passing in values
for the quantity to be converted and name of the imperial unit:
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