Popokoko Popokoko - 2 years ago 86
Java Question

Java: Removing comments from string

I'd like to do a function which gets a string and in case it has inline comments it removes it. I know it sounds pretty simple but i wanna make sure im doing this right, for example:

private String filterString(String code) {
// lets say code = "some code //comment inside"

// return the string "some code" (without the comment)

I thought about 2 ways: feel free to advice otherwise

  1. Iterating the string and finding double inline brackets and using substring method.

  2. regex way.. (im not so sure bout it)

can u tell me what's the best way and show me how it should be done? (please don't advice too advanced solutions)

edited: can this be done somehow with Scanner object? (im using this object anyway)

rsp rsp
Answer Source

To find the substring before a constant substring using a regular expression replacement is a bit much.

You can do it using indexOf() to check for the position of the comment start and substring() to get the first part, something like:

String code = "some code // comment";
int    offset = code.indexOf("//");

if (-1 != offset) {
    code = code.substring(0, offset);
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