JavaScript RegExp object

JavaScript RegExp object

Regular expressions are objects that describe patterns of characters.

Regular expressions are used for pattern matching and retrieval and replacement of strings, and are powerful tools for performing pattern matching on strings.

grammar

var patt=new RegExp(pattern,modifiers);

or the simpler way:

var patt = / pattern / modifiers;

• pattern (pattern) describes the pattern of the expression
• modifiers are used to specify global matching, case-sensitive matching, and multi-line matching

    Note: When using the constructor to create regular objects, the normal character escaping rules (preceding backslash \) are required.

modifier

Modifiers are used to perform case-sensitive and global matching:

Square brackets

Square brackets are used to find a range of characters:

metacharacter

Metacharacters are characters with special meanings:

quantifier

Methods of String objects that support regular expressions

 

 

---

 

Excerpted from the Reference Manual for the JavaScript RegExp Object of the  Rookie Tutorial