如何从给定的字符串中删除 substring？

Question

Is there an easy way to remove substring from a given String in Java?

Example: "Hello World!" , removing "o" → "Hell Wrld!"

Answer 1

You could easily use String.replace() :

String helloWorld = "Hello World!";
String hellWrld = helloWorld.replace("o","");

Answer 2

You can use StringBuffer

StringBuffer text = new StringBuffer("Hello World");
text.replace( StartIndex ,EndIndex ,String);

Answer 3

Check out Apache StringUtils :

• static String replace(String text, String searchString, String replacement) Replaces all occurrences of a String within another String.
• static String replace(String text, String searchString, String replacement, int max) Replaces a String with another String inside a larger String, for the first max values of the search String.
• static String replaceChars(String str, char searchChar, char replaceChar) Replaces all occurrences of a character in a String with another.
• static String replaceChars(String str, String searchChars, String replaceChars) Replaces multiple characters in a String in one go.
• static String replaceEach(String text, String[] searchList, String[] replacementList) Replaces all occurrences of Strings within another String.
• static String replaceEachRepeatedly(String text, String[] searchList, String[] replacementList) Replaces all occurrences of Strings within another String.
• static String replaceOnce(String text, String searchString, String replacement) Replaces a String with another String inside a larger String, once.
• static String replacePattern(String source, String regex, String replacement) Replaces each substring of the source String that matches the given regular expression with the given replacement using the Pattern.DOTALL option.

Answer 4

replace('regex', 'replacement');
replaceAll('regex', 'replacement');

In your example,

String hi = "Hello World!"
String no_o = hi.replaceAll("o", "");

Answer 5

This works good for me.

String hi = "Hello World!"
String no_o = hi.replaceAll("o", "");

or you can use

String no_o = hi.replace("o", "");

Answer 6

您应该查看StringBuilder/StringBuffer ，它允许您在指定的offset处删除、插入、替换字符。

Answer 7

如果您知道开始和结束索引，您可以使用它

string = string.substring(0, start_index) + string.substring(end_index, string.length());

Answer 8

replaceAll(String regex, String replacement)

Above method will help to get the answer.

String check = "Hello World";
check = check.replaceAll("o","");

Answer 9

You can use Substring also for replacing with existing string:

var str = "abc awwwa";
var Index = str.indexOf('awwwa');
str = str.substring(0, Index);

Answer 10

You can also use guava's CharMatcher.removeFrom function.

Example:

 String s = CharMatcher.is('a').removeFrom("bazaar");

Answer 11

private static void replaceChar() {
    String str = "hello world";
    final String[] res = Arrays.stream(str.split(""))
            .filter(s -> !s.equalsIgnoreCase("o"))
            .toArray(String[]::new);
    System.out.println(String.join("", res));
}

In case you have some complicated logic to filter the char, just another way instead of replace() .

Answer 12

Here is the implementation to delete all the substrings from the given string

public static String deleteAll(String str, String pattern)
{
    for(int index = isSubstring(str, pattern); index != -1; index = isSubstring(str, pattern))
        str = deleteSubstring(str, pattern, index);

    return str;
}

public static String deleteSubstring(String str, String pattern, int index)
{
    int start_index = index;
    int end_index = start_index + pattern.length() - 1;
    int dest_index = 0;
    char[] result = new char[str.length()];


    for(int i = 0; i< str.length() - 1; i++)
        if(i < start_index || i > end_index)
            result[dest_index++] = str.charAt(i);

    return new String(result, 0, dest_index + 1);
}

The implementation of isSubstring() method is here

Answer 13

You can use

String helloWorld = "Hello World";
String target = "e";
String replacement = "";
String replacedString = helloWorld.replace(target, replacement);

The answer is = Hllo World

or you can use regex

String original = "Java is one of best languages. OOP can be used in Java";
String regexTarget = "\\bJava\\b";
String replacedWord = original.replaceAll(regexTarget, "Python");

The answer is = Python is one of best languages. OOP can be used in Python

Answer 14

In addition to @DwB answer, you can also use StringUtils remove :

String hello = "hello world";
String hellYeah = StringUtils.remove(hello, "o");

or removeIgnoreCase :

String hello = "hellO world";
String hellYeah = StringUtils.remove(hello, "o");