Regular expression: special character Fu Zhi "-" (minus) _ Regular expression

The minus sign is used in the character set "[...]" Represents a set of characters, such as:

"[3-5]"--represents any one of the characters from 3 to 5, so "iphone[4-7]>" means matching iphone4 or iphone5 or iphone6 or Iphone7
"[X-z]"--to indicate matching x or Y or Z

If it is not used in the character set "[...]" , is the ordinary character, that is, the minus sign, such as:

"Apple-[1-3]"--Indicates matching "apple-1", "apple-2" or "apple-3"

Even in the character set "[...]" , but not a continuous character segment, the minus sign also loses a special meaning, such as:

"Apple[-1]"--Indicates matching "apple-" or "Apple1"