difference between replace and replaceall in java

in java, both `replace` and `replaceall` methods are used to replace occurrences of a specified character or substring within a string. however, they differ in terms of the type of input they accept and how they perform replacements.

### `replace` method:
- the `replace` method replaces all occurrences of a specified character sequence with another character sequence.
- it accepts two parameters: the character sequence to be replaced and the character sequence to replace it with.
- the `replace` method is case-sensitive.

### syntax:

### example:

### `replaceall` method:
- the `replaceall` method replaces all occurrences of a specified regular expression pattern with another string.
- it accepts two parameters: a regular expression pattern to be replaced and the replacement string.
- the `replaceall` method can be used for more complex replacements, such as replacing patterns using regular expressions.

### syntax:

### example:

### key differences:
1. `replace` only accepts a plain character sequence, while `replaceall` accepts a regular expression pattern.
2. `replace` is case-sensitive and replaces exact matches, while `replaceall` can perform complex replacements using regular expressions.

in summary, use the `replace` method for simple character replacements, and use the `replaceall` method for more advanced replacements involving regular expressions.

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