Parse.File base64 validation causes runaway regular expression

[justin-mclaren]

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest versions of Parse Server and the Parse JS SDK.

Issue Description

Using the Parse.file constructor with some base64 strings causes the browser to hang indefinitely. I believe this is a case of a runaway regular expression, probably caused by the use of Regex constructors instead of Regex string literals.

Steps to reproduce

Create a new Parse.File with the base64 string here: https://github.com/chinapalace/base64-string/blob/main/README.md
ex. new Parse.File({base64: <sample string above>})

Actual Outcome

The browser hangs indefinitely when I try to instantiate a ParseFile with certain base64 strings.

Expected Outcome

A ParseFile is instantiated successfully.

Environment

Chrome Version 105.0.5195.102 (Official Build) (arm64)

Client

• Parse JS SDK version: 3.4.4

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[mtrezza]

Closing as duplicate of #1532