Issues with strings and regular expressions in ruby

The ruby regular expression is a Regexp class object.

Main metacharacters

Sn	Meaning	Example	Xiaoming
^	Header	/^ ABC/	ABC begin
$	End of line	/ABC $/	ABC too many rows
.	Any limit 1 Text	/A. B/	A between B between 1 Text
[...]	[] Inner limit 1 Text	/[A-Za-Z]/	English
[^...]	[] The inner vertex contains the inner vertex 1 text.	/[^ 0-9]/	Not a number
*	0 or more	/.*/	A worker starts worker
+	1 or more	/A +/	1 or more times
?	0-back rollback-1-back	/AA? /	A few minutes without AA
A | B	A worker B	/^ (ABC) | (ABC) $/	ABC too many ABC too rows
(...)	Zookeeper regionalization	/(ABC) +/	When ABC returns a response, more than one response is returned.
\ W	English digit comment _	/^ \ W + $/	English digit comment _ blank Comment comment row
\ W	Outside of the English digit limit _	/Hello, \ Wworld/	Hello, there is a world outside the English number comment _ 1 Text
\ S	Blank text	/Hello, \ sworld/	Hello, please world blank text
\ S	Other than blank text	/Hello \ sworld/	Hello, there is no space for reading 1 Text
\ D	Number	/A \ D/	A branch number 1 Text
\ D	Not a number	/A \ D/	A: 1 text not included in the number

The result is as follows: