How to replace first occurrence of string in Java

I want to replace first occurrence of String in the following.

  String test = "see Comments, this is for some test, help us"

**If test contains the input as follows it should not replace

1. See Comments, (with space at the end)
2. See comments,
3. See Comments**

I want to get the output as follows,

 Output: this is for some test, help us

Thanks in advance,

Solution 1:

You can use replaceFirst(String regex, String replacement) method of String.

Solution 2:

You should use already tested and well documented libraries in favor of writing your own code.

org.apache.commons.lang3.
  StringUtils.replaceOnce("coast-to-coast", "coast", "") = "-to-coast"

Javadoc

• https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/StringUtils.html#replaceOnce-java.lang.String-java.lang.String-java.lang.String-

There's even a version that is case insensitive (which is good).

Maven

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.7</version>
</dependency>

Credits

My answer is an augmentation of: https://stackoverflow.com/a/10861856/714112

Solution 3:

You can use following statement to replace first occurrence of literal string with another literal string:

String result = input.replaceFirst(Pattern.quote(search), Matcher.quoteReplacement(replace));

However, this does a lot of work in the background which would not be needed with a dedicated function for replacing literal strings.