Find and Replace a Word

Easy ⏱ 8 min 85% acceptance ★★★★☆ 4.3
Write replace_word(s, old, new) that returns s with every exact, case-sensitive occurrence of old replaced by new.

Examples

Example 1
Input
s = 'I like cats. Cats are great.', old = 'Cats', new = 'Dogs'
Output
'I like cats. Dogs are great.'
Explanation

Only the capitalized 'Cats' matches; lowercase 'cats' is untouched.

Constraints

  • old is non-empty.

Topics

Stringsreplace

Companies

SwiggyUber

Hints

Hint 1

`str.replace(old, new)` replaces all occurrences by default.

← Count Substring Occurrences Locate a Substring's Position →
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