MCP HTTP/SSE mode
Credit: ExpressVPN，这一点在新收录的资料中也有详细论述
。新收录的资料是该领域的重要参考
Apparently, it's supposed to recognise phone numbers and seems to come from the Elementor WordPress builder, which would explain why the same regex occurs so frequently. It also seems that the code is embedded as hidden on many, many pages, further boosting the number of hits since my analysis cannot tell the difference between a visible and an invisible element. Elementor offered no straightforward way to report this bug, so I gave up.，推荐阅读新收录的资料获取更多信息
Returns the byte length of the string. This is a property, not a function call.