how to replace 'x\d+' by 'X(...same number as \d+ ...)' such as x45 --> X(45) using regexprep ?

Hello, I'm searching for replacing, in a text file, strings having 'x' as only non numeric character at the beginning, followed by a number, by 'X(' followed by the same number and followed by ')' using regexprep. For example, I'd want to replace such a line :

' h(1) = -(x21 + x53)/x9 + x183 '

by

' h(1) = -(X(21) + X(53))/X(9) + X(183) '

all the things I tried since yesterday didn't work ... Could you help me ? Thank you

[genevois pierre]

Hi again, in fact I had a more general problem : I want to add a constant number to the number that is replaced, for example :

const = 300

line = ' h(1) = -(x21 + x53)/x9 + x183 + b125'

to be replaced by

newline = ' h(1) = -(X(21) + X(53))/X(9) + X(183) + X(425)'

in the last operation, b becomes X and the number is the original one + const ... I tried

    for ib = 1:b_varscount
        string1 = ['b', num2str(ib)];
        string2 = ['X(', num2str(ib+const), ')'];
        newline = regexprep(line, string1, string2);
    end

but it doesn't work when ib has more than one digit !

thank you for your help.

Answer 1

[Stephen23]

>> str = ' h(1) = -(x21 + x53)/x9 + x183 ';
>> regexprep(str,'x(\d+)','X($1)')
ans =  h(1) = -(X(21) + X(53))/X(9) + X(183)

[genevois pierre]

Thank you !