Static XML_RE 

pub static XML_RE: LazyLock<Regex>

A lazily initialized regular expression that matches excess whitespace between XML/HTML tags.

This regex helps in cleaning up formatted or pretty-printed XML/HTML by removing unnecessary spaces, newlines, or indentation between tags. It specifically looks for occurrences where a > (closing tag or self-closing tag) is immediately followed by whitespace (spaces, tabs, or newlines) and then a < (opening tag).

Notes

• This regex is compiled once and reused, improving performance.
• The multi_line(true) flag (if used with RegexBuilder) ensures it applies across multiple lines.
• This is particularly useful for XML minification or normalization before processing.