角色替换

Question

I have the following string value.

var stringVal = [4|4.6]^Size{1}~[6];

I want to replace everything before the first ^ occurrence with [1|5] how do I go about doing this?

Thanks in advance.

Answer 1

A simple regex will do:

var stringVal = '[4|4.6]^Size{1}~[6]';
stringVal.replace(/^.*?\^/, '[1|5]^');
#=> "[1|5]^Size{1}~[6]"

Regex explanation:

 ^   start of string
 .   any character
 *?  repeat >= 0 times, but match as less characters as possible (non-greedy)
 \^  match '^' (a simple `^` matches the start of the string, so we need to escape it

Another, faster way, which would work for this case:

'[1|5]' + stringVal.substr(stringVal.indexOf('^'))