WebUI: migrate to ESLint v9

[Chocobo1]

• WebUI: migrate to ESLint v9
• WebUI: add linting for regular expressions
  And applies to following suggestions:
  • Use case-insensitive flag i
  • Use \w for matching characters
  • Sort the regex flags

[Chocobo1]

@Piccirello
I plan to enforce single quotes in webUI in a follow up PR, I mean migrate from double quotes as much as possible. This is to unify the coding style. I don't have strong opinion and a quick web search shows that web devs mostly prefer single quotes. Any comment?

https://eslint.org/docs/latest/rules/quotes
The avoidEscape and allowTemplateLiterals will be true of course.

[Piccirello]

@Piccirello I plan to enforce single quotes in webUI in a follow up PR, I mean migrate from double quotes as much as possible. This is to unify the coding style. I don't have strong opinion and a quick web search shows that web devs mostly prefer single quotes. Any comment?

https://eslint.org/docs/latest/rules/quotes The avoidEscape and allowTemplateLiterals will be true of course.

I'm personally more familiar with using double quotes in a JS codebase. Either should be fine though if it's enforced via eslint.