fix: regex & omit vars when no value

[iamayushdas]

Please answer these questions before submitting a pull request, or your PR will get closed.

Why submit this pull request?

• Improve performance
• Backport patches

What changes will this PR take into?

• update Regex according to schema_def
• omit vars field in Route when no value contained
  Please update this section with detailed description.

Related issues

fix/resolve #1798

Checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

cc - @juzhiyuan @liuxiran @starsz @LiteSun

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[guoqqqi]

It is better to add this assertion after line 222 to ensure that the vars field disappears.

      cy.contains('vars').should('not.exist');

[iamayushdas]

It is better to add this assertion after line 222 to ensure that the vars field disappears.

      cy.contains('vars').should('not.exist');

added , thanks for nice suggestion @guoqqqi

[codecov-commenter]

Codecov Report

Merging #1921 (e25940c) into master (91ad26b) will decrease coverage by 2.87%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1921      +/-   ##
==========================================
- Coverage   67.00%   64.13%   -2.88%     
==========================================
  Files         169      122      -47     
  Lines        6314     3112    -3202     
  Branches      745      748       +3     
==========================================
- Hits         4231     1996    -2235     
+ Misses       1832     1116     -716     
+ Partials      251        0     -251     

Flag	Coverage Δ
backend-e2e-test	?
backend-e2e-test-ginkgo	?
backend-unit-test	?
frontend-e2e-test	64.13% <100.00%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...b/src/components/Plugin/UI/referer-restriction.tsx	66.66% <ø> (ø)
web/src/components/Upstream/components/Nodes.tsx	100.00% <ø> (ø)
...mponents/Upstream/components/active-check/Host.tsx	33.33% <ø> (ø)
...pages/Route/components/Step1/RequestConfigView.tsx	81.48% <ø> (ø)
web/src/pages/Route/transform.ts	72.35% <100.00%> (-0.11%)	⬇️
api/internal/handler/global_rule/global_rule.go
api/internal/handler/ssl/ssl.go
api/internal/handler/consumer/consumer.go
api/cmd/managerapi.go
... and 45 more

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