Replacement text in 'regexprep' function is recognized as function and gives an error

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In the script I'm using, matched text needs to be replaced with 'f_and($1,$2)'. Replacement text in 'regexprep' function gives this error:

Error using regexprep
Evaluation of 'f_and($1,$2)' failed: 
Undefined function 'f_and' for input arguments of type 'char'.
Error in analysis>addGeneData (line 167)
                g = regexprep(g,match_expr,replace_expr,'once');
Error in analysis>geneToReaction (line 114)

It doesn't make sense that text is recognized as function and gives an error. Code section that causes error is shown below:

                match_expr      = ['(',ApmB,')\s+and\s+(',ApmB,')'];
                replace_expr    = '${f_and($1,$2)}';
                g = regexprep(g,match_expr,replace_expr,'once');

Glad if you help. Thanks...