JS Regular expression symbol meaning

\ Do as a turn, that is, usually after the "\" character is not interpreted as the original meaning, such as/b/match character "B", when B is preceded by a backslash/\b/, turn to match the boundary of a word.
Or
The restoration of a regular expression feature character, such as "*" matches its preceding metacharacters 0 or more times,/a*/will match a,aa,aaa, adding "\",/a\*/will only match "a *".

^ matches the beginning of an input or a line,/^a/matches "an A", and does not match "an A"
$ matches the end of an input or a line,/a$/matches "an A", and does not match "an A"
* Match the preceding metacharacters 0 or more times,/ba*/will match b,ba,baa,baaa
+ Match Front metacharacters 1 or more times,/ba*/will match ba,baa,baaa
? Match the preceding metacharacters 0 or 1 times,/ba*/will match B,ba
(x) match x Save x in a variable named $1...$9
X|y match x or Y
{n} exact match n times
{n,} matches more than n times
{n,m} matches n-m times
[XYZ] Character set (character set) that matches any one by one characters (or metacharacters) in this set
[^XYZ] does not match any one of the characters in this set
[\b] matches a backspace
\b matches the boundary of a word
\b matches the non-boundary of a word
\CX here, X is a control character,/\cm/matches Ctrl-m
\d matches a character number character,/\d/=/[0-9]/
\d matches a non-alphanumeric character,/\d/=/[^0-9]/
\ n matches a line break
\ r matches a carriage return character
\s matches a white space character, including \n,\r,\f,\t,\v, etc.
\s matches a non-whitespace character equal to/[^\n\f\r\t\v]/
\ t matches a tab
\v matches a straight tab
\w matches a character that can make up a word (alphanumeric, which is my paraphrase, with numbers), including underscores, such as [\w] matches 5 in "$5.98", equals [a-za-z0-9]
\w matches a character that cannot be composed of words, such as [\w] matches $ in "$5.98", equal to [^a-za-z0-9].

JS Regular expression symbol meaning