refactor: use strict equality in RegExp exec checks

[singhankit001]

This PR refactors != null to !== null for RegExp.exec return value checks in src/Lexer.ts and src/Tokenizer.ts.\nSince RegExp.exec only returns RegExpExecArray or null, !== perfectly aligns with the required behavior and improves strict equality consistency across the codebase.

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[gemini-code-assist]

Code Review

This pull request updates several while loop conditions in Lexer.ts and Tokenizer.ts to use strict inequality (!== null) instead of loose inequality (!= null) when checking the result of RegExp.exec(). I have no feedback to provide.

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Project	Deployment	Actions	Updated (UTC)
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