Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java String replaceAll() Method?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
___ myStr = "I love cats. Cats are very easy to love. Cats are very popular.";3Order
Put the learning moves in the order that makes the concept easiest to apply.
The replaceAll() method replaces all the matches of a regular expression in a string with a new substring.
Definition and Usage
Java String replaceAll() Method
❮ String Methods
Example
String myStr = "I love cats. Cats are very easy to love. Cats are very popular.";
String regex = "(?i)cat";
System.out.println(myStr.replaceAll(regex, "dog"));Definition and Usage
The replaceAll() method replaces all the matches of a regular expression in a string with a new substring.
Tip
See the Java RegEx tutorial to learn about regular expressions.
Syntax
public String replaceAll(String
regex , String
replacement )Parameter Values
| Parameter | Description |
|---|---|
| regex | Required. A regular expression defining what substrings to search for. |
| replacement | Required. The substring which will replace each match. |
Technical Details
| Returns: | A copy of the string in which matches of the regular expression are replaced with new substrings. |
|---|---|
| Throws: | PatternSyntaxException - If the syntax of the regular expression is incorrect. |
| Java version: | 1.4 |