使用正则表达式删除Java中的转义unicode字符串

Question

I have string like below

"them coming \nLove it \ud83d\ude00"

I want to remove this character "\?\?" . so it will be

"them coming \nLove it "

How can I achieve this in java? I have tried with code like below but it won't works

payload.toString().replaceAll("\\\\u\\b{4}.", "")

Thanks :)

Answer 1

I think \\\\\\\\u\\\\b{4}. will not work, because regex treat \? as a symbol , not a literal string. So to match this kind unwanted (for any reason) unicode characters it will be better to exclude character you accept(don't want to replace), so for ecample all ASCII character, and match everything else (what you want to replace). Try with:

[^\x00-\x7F]+

The \\x00-\\x7F includes Unicode Basic Latin block .

String str = "them coming \nLove it \ud83d\ude00";
System.out.println(str.replaceAll("[^\\x00-\\x7F]+", ""));

will result with:

them coming
Love it

However, you willl hava a problem, if you use national character, any other non-ASCII symbols (ś,ą,♉,☹,etc.).