如何在两个字符之间替换字符？

Question

I have strings "ABC DE", "ABC FE", "ABC RE".

How to replace the characters between ABC and E using regex?

Trying to do this with a regex and replace

str.replace((ABC )[^*](E), 'G');

Answer 1

If you want to remove any characters that appear between "ABC " and "E", then you could accomplish this via lookaheads and the replaceAll() method :

String[] strings = { "ABC DE", "ABC FE", "ABC RE" };
for(int s = 0; s < strings.length; s++){
    // Update each string, replacing these characters with a G
    strings[s] = strings[s].replaceAll("(?<=ABC ).*(?=E)","G"));
}

Likewise if you didn't explicitly want the space after "ABC", simply remove it from the lookahead by using (?<=ABC).*(?=E) .

You can see an interactive example of this here .

Answer 2

You probably want to use regex replaceAll with "ABC(.*?)E" instead.

str = str.replaceAll("ABC(.*?)E", "G");

Explanation:

ABC matches the characters ABC literally (case sensitive)
1st Capturing group (.*?)
.*? matches any character (except newline)
Quantifier: *? Between zero and unlimited times, as few times as possible, expanding as needed [lazy]
E matches the character E literally (case sensitive)