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JavaScript `string.replace()` useful cases
- 1. Simple String Replacement: Replace the first occurrence of a substring.
- 2. Global String Replacement: Replace all occurrences of a substring with the global flag.
- 3. Case-insensitive Replacement: Make the replacement case-insensitive with the i flag.
- 4. Replace Whole Words (Word Boundary): Replace only whole words using the \b word boundary.
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