[WIP] Add pages for ZIP code and other regex patterns

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create pages for ZIP code, Card, Number, Domain, URL/Path, IP, Unix/Windows Path regexes with best-practices, notes, and exhaustive tests</issue_title>
<issue_description>## New Pages for Common Regex Patterns
Create detailed documentation and implementation pages for the following pattern categories:

• ZIP Code
• Credit/Debit Card
• Numbers
• Domain
• URL & Path
• IP Address
• Unix Path
• Windows Path

Each page should follow the approach and design used for the Email and other existing regex pages. For each new pattern type:

• Document the industry-standard regex (with references, if applicable)
• Include notes/warnings about validity, edge cases, and standards/best-practices
• Add a table with an exhaustive test suite of valid and invalid examples, covering edge cases and common scenarios
• Ensure regular expressions are well-commented and readable
• Where appropriate, reference relevant standards (e.g. RFCs for domains, ZIP codes, IP addresses)
• Include links to documentation or external standards when possible

Deliverable:

• Eight new pages (one for each pattern)
• Consistent format and thorough coverage for each category
• Test suites in tables for each page

Reference:

• Use the Email regex page and other documented regex pattern pages as examples.

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Note: Make sure all regular expressions are valid, exhaustive, and adhere to best practices. Where industry standards exist, follow them. Test suites must comprehensively verify regex behavior including edge cases and malformed input.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create pages for ZIP code, Card, Number, Domain, URL/Path, IP, Unix/Windows Path regexes with best-practices, notes, and exhaustive tests #22

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