How to Use `replaceAll` Method in Java for String Manipulation

What is the purpose of the `replaceAll` method in Java, and how can I use it for string manipulation?

String newString = originalString.replaceAll("regex", "replacement");

The `replaceAll` method in Java is a powerful utility for replacing substrings in a string based on a regular expression (regex). It allows you to specify a pattern that will be searched and replaced with a specified replacement string.

String originalString = "The quick brown fox jumps over the lazy dog.";
String newString = originalString.replaceAll("[aeiou]", "*"); // Replaces all vowels with '*'.

Causes

• Incorrect regular expressions leading to unexpected replacements.
• Misunderstanding the difference between `replace` and `replaceAll`.

Solutions

• Always test your regex patterns separately before using them in `replaceAll`.
• Use `replace` if you want to replace substrings without regex.

Mistake: Using `replaceAll` when only simple replacements are needed.

Solution: Use `replace` when you don't require regex for the replacement.

Mistake: Ignoring case sensitivity of regex patterns.

Solution: Use `(?i)` to make your regex case-insensitive.