fix(common): allow DateInput to accept a dot separator

[adarshswaminath]

What changed? Why?

DateInput with separator="." dropped normal keystrokes. Typing 08 was treated as a doubled separator, so the field could not become 08.18.2024.

The dot is now escaped in the duplicate-separator check. 08..18 is still blocked. / and - are unchanged. Web and mobile DateInput both use this shared code

Fixes #905

Root cause (required for bugfixes)

IntlDateFormat built the check with new RegExp(${separator}{2,}). In a regular expression, . means "any character," so any two characters looked like ...

UI changes

No layout or style change. The only difference is that a dotted date can be typed.

iOS Old	iOS New
n/a	n/a

Android Old	Android New
n/a	n/a

Web Old	Web New
With separator=".", a second digit is ignored	Typing 08182024 shows 08.18.2024

Testing

How has it been tested?

• Unit tests
• Interaction tests
• Pseudo State tests
• Manual - Web
• Manual - Android (Emulator / Device)
• Manual - iOS (Emulator / Device)

Testing instructions

Unit test:

yarn nx run common:test --testPathPattern=src/dates/__tests__/IntlDateFormat.test.ts

Storybook:

1. Run yarn nx run storybook:dev and open Components → Dates → DateInput.
2. Set one DateInput to separator=".".
3. Clear the field and type 08182024.
4. The field should show 08.18.2024. A doubled dot such as 08..18 should still be rejected.

Illustrations/Icons Checklist

Required if this PR changes files under packages/illustrations/** or packages/icons/**

Not applicable.

• verified visreg changes with Terran (include link to visreg run/approval)
• all illustration/icons names have been reviewed by Dom and/or Terran

Change management

type=routine
risk=low
impact=sev5

automerge=false

[cb-heimdall]

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