Regex Editor & Tester

This PCRE2 regex (with global/multiline flags) matches LaTeX tilde accent commands applied to symbols, such as `\tilde \alpha` or `\tilde x`. It captures the literal `\tilde`, allows optional whitespace or line breaks before the argument (handling wrapped lines), then captures `\alpha`, `\beta`, `\gamma`, or a run of letters excluding lowercase 'i'. Useful for parsing, refactoring, or validating mathematical LaTeX source code.