How should I practice Validate a Word Abbreviation?

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Problem · String

Validate a Word Abbreviation

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Problem statement

Given strings word and abbreviation, determine whether abbreviation is a valid abbreviation of word.

Read both strings from left to right:

A letter in abbreviation must equal the current letter in word.
A maximal run of decimal digits represents the number of letters to skip in word.
A number cannot have a leading zero.
A skip cannot move past the end of word.

The abbreviation is valid only when both inputs are consumed completely.

Function

validWordAbbreviation(word: String, abbreviation: String) → boolean

Examples

Example 1

word = "internationalization"abbreviation = "i12iz4n"return = true

The abbreviation keeps i, skips 12 letters, keeps i and z, skips 4 letters, and keeps the final n.

Example 2

word = "apple"abbreviation = "a2e"return = false

After matching a and skipping two letters, the abbreviation's e is compared with l, so the strings do not match.

Example 3

word = "substitution"abbreviation = "s010n"return = false

The numeric token begins with 0, so the abbreviation is invalid even though its numeric value could otherwise be parsed.

Constraints

word contains letters.
abbreviation contains letters and decimal digits.
Letter matching is case-sensitive.
Every numeric token fits in a signed 32-bit integer.