[Form] fixed ServerParams::getPostMaxSize() regex pattern
merged branch jfsimon/issue-7480 (PR #7481)

This PR was merged into the master branch.

Discussion
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[Form] fixes ServerParams::getPostMaxSize() regex pattern

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7480

Commits
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84541e7 [Form] fixed ServerParams::getPostMaxSize() regex pattern