修剪Java字符串中不需要的字符

Question

I have few Java Strings like below:

ab-android-regression-4.4-git
ab-ios-regression-4.4-git
ab-tablet-regression-4.4-git

However, I do not want such lengthy and unwanted names and so I want to get rid of starting ab- and ending -git part. The pattern for all the Strings is the same (starts with ab and ends with git)

Is there a function/class in Java that will help me in trimming such things? For example, something like:

String test = "ab-android-regression-4.4-git";
test.trim(ab, git)

Also, can StringUtils class help me with this? Thoughts on regular expressions?

EDITED PART: I also want to know how to eliminate the - characters in the Strings and change everything to uppercase letters

Answer 1

Here's a method that's more general purpose to remove a prefix and suffix from a string:

public static String trim (String str, String prefix, String suffix)
{
    int indexOfLast = str.lastIndexOf(suffix);

    // Note: you will want to do some error checking here 
    // in case the suffix does not occur in the passed in String

    str = str.substring(0, indexOfLast);

    return str.replaceFirst(prefix, "");
}

Usage:

String test = "ab-android-regression-4.4-git";
String trim = trim(test, "ab-", "-git"));

To remove the "-" and make uppercase, then just do:

trim = trim.replaceAll("-", " ").toUpperCase();

Answer 2

由于要修剪的部分的大小是恒定的，因此您应该简单地使用substring：

yourString.substring(3, yourString.length - 4)

Answer 3

You can use test = test.replace("ab-", "") and similar for the "-git" or you can use test = StringUtils.removeStart(test, "ab-") and similarly, removeEnd .

I prefer the latter if you can use StringUtils because it won't ever accidentally remove the middle of the filename if those expressions are matched.

Answer 4

If your string always contains ab- at the begining and -git at the end then here is the code

String test = "ab-android-regression-4.4-git";
test=test.substring(3, s.length() - 4);
System.out.println("s is"+s);  //output is android-regression-4.4

To know more about substrings click https://docs.oracle.com/javase/tutorial/java/data/manipstrings.html