Insert character before specific character c #
2 answers
var a = "y=x^7+3x^4-x+5";
var b = Regex.Replace(a, @"(\d+|[a-zA-Z])(?=\d+|[a-zA-Z])", @"$1*");
var c = Regex.Replace(b, @"x", @"0");
summery 2nd line : match any number or variable followed by any number or variable.
Output examples:
In: y=33xggyz/3/4*x/x+xx1 | In: y=x^7+3x^4-x+5
Out:y=33*x*g*g*y*z/3/4*x/x+x*x*1 | Out:y=0^7+3*0^4-0+5
|
In: y=2+33xggyz/3/4*x/x+xx | In: y=x1
Out:y=2+33*0*g*g*y*z/3/4*0/0+0*0 | Out:y=0*1
|
In: y=10xy^2+xx+(12x+1yy) | In: y(xx)=1
Out:y=10*0*y^2+0*0+(12*0+1*y*y) | Out:y(0*0)=1
Updated: (7/4/2015) bug fixed, failed with y = x1 (returned y = 01)
+3
source to share
In this case, when you just want to o change
y=x^7+3x^4-x+5
to
y=0^7+3*0^4-0+5
It would be easy to add another variable.
int x = //Whatever x is going to be;
int j = 0;
int y = j^7+3x^4-j+5
Now, if you have more user cases than just this one, you can add a lot of variables, in which case you don't want to use this parameter. But if you are using it for an isolated case, this might be a viable answer.
0
source to share