i have a dynamic string expression var expression = "count+count1+12-(count3+count4)";
I want to append v[...] in each string like this output
Output:-
v[count]+v[count1]+12-(v[count3]+v[count4]);
i have tried this regex expression,
expression = expression.replace(/[a-z]+|[A-Z]+/g, "v["/$1/"]").replace(/[\(|\|\.)]/g, "");
is it possible to write regex expression regex string.
You may use
var expression = "count+count1+12-(count3+count4)";
var res = expression.replace(/\b[a-z]\w*/ig, "v[$&]");
console.log(res);Details:
\b - a leading word boundary[a-z] - an ASCII letter\w* - 0+ word chars ([a-zA-Z0-9_]).The replacement contains $&, a backreference to the whole match.
Another solution that splits with the math operators and only wraps with v[...] those substrings that are not a number or the operator:
var expression = "count+count1+12+234.56-(count3+count4)";
var res = expression.split(/([-+\/*])/).map(function(x) {
return /^(\d*\.?\d+|[-*\/+])$/.test(x) ? x : "v["+x+"]";
}).join("");
console.log(res);