What does such a regular expression validate?

Question

Regular Expressions

I analyze the obfuscated code, in many places there is such a regular expression (in the context of larger ones), but I just can’t understand what it filters?
\\x1\d{6}

Answer 1

the example above uses the \xdd metacharacter used to find latin characters by specifying their hex value
\d - means parsing numbers (0-9)
{6} - means 6-digit number
1 - hex value starts at 1

Answer 2

Actually, what do you not understand? What values ​​(for example, email, ip, etc) or what kind of strings ( "\x1012345" ) match this regular expression?