Backport: Removal of regex usage on denom validation (backport #570)

[mergify]

Description

Closes: #XXXX

Backports removal of regex usage on denom validation upstream

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Summary by CodeRabbit

• Refactor
  • Improved handling and validation of coin denominations.
• Tests
  • Enhanced testing for coin denomination validation.
• New Features
  • Added custom parsing logic for coin denominations.
  • Introduced a function to parse amount and denomination from a coin string.

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This is an automatic backport of pull request #570 done by [Mergify](https://mergify.com).

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