feat: explicit the word boundary

[poyoho]

Description

@patak-dev @eugene1g

1. Do not allow preceding '.', but do allow preceding '...' for spread operations for the import expression
2. replace comment string and string value to ' ' and the match the import url position

mentioned #7549

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[bluwy]

Neat regex tricks.