A regular expression of javascript

Regular Expressions ( RegularExpression): According to a certain rule to match the qualifying string, through the built-in object RegExp support Regular expression, In general, a regular expression is a character that corresponds to a character string.

instantiation of the methods for REGEXP objects are: literals and constructors.

Common modifiers are: G Global full text Search, not added, search to the first match to stop.

I igonre case ignores casing, which is case sensitive by default.

m multiple lines multi-line search.

Regular expressions consist of two basic character types: literal text characters and metacharacters.

Metacharacters is a non-alphabetic character with a special meaning in a regular expression, such as: * \ [] {}? $^+| and so on.

Characters commonly used characters are: \ t horizontal tab

\v Vertical Tab

\ n line break

\ r return character

\o Empty characters

\f Page Break

\CX control character (ctrl+x) corresponding to X

Using [] to build a simple class, a class is an object that conforms to certain attributes, a generic rather than a character, such as an expression [ABC] that converts a character A or B or C to a class, and the expression can match such characters.

Using the metacharacters ^ to create a negative or inverse class, the reverse class means something that is not part of a class, such as: an expression [^ABC] represents something that is not a character A or B or C.

Use metacharacters-Create scope classes such as: [A-z] to concatenate two characters representing any character from A to Z, which is a closed interval that contains A and z itself.

in the [] the inner part of a class can be ligatures such as:[a-za-z].

If you want to remove the symbol class, write the symbol that you want to remove on the back of the page such as:[a-z-].

A regular expression of javascript