JavaScript Object : RegExp Object
- Regular Expression is best way for pattern matching.
- Regular Expression Object is pattern of the character that we are going to match with String provided by user.
- Regular Expression is used to match pattern and to perform “search and replace” function.
Syntax : RegExp Object in JavaScript
var str = new RegExp(pattern,modifiers);
- pattern will specify the pattern of the expression.
- modifier will tell whether the search is
- Case-sensitive
- Global
- Multi-line.
| Modifier | Description |
|---|
| i | This Modifier is used to perform Case Insensitive Search Operation |
|---|
| g | This Modifier is used to perform Global Match |
|---|
| m | This Modifier is used to perform Multiline Matching |
|---|
Brackets : Find a range of characters
| Expression | Description |
|---|
| [abc] | Find any character between the brackets |
| [^abc] | Find any character not between the brackets |
| [0-9] | Find any digit from 0 to 9 |
| [A-Z] | Find any character from uppercase A to uppercase Z |
| [a-z] | Find any character from lowercase a to lowercase z |
| [A-z] | Find any character from uppercase A to lowercase z |
| [adgk] | Find any character in the given set |
| [^adgk] | Find any character outside the given set |
| (red|blue|green) | Find any of the alternatives specified |
Metacharacters : Characters with a special meaning
| Metacharacter | Description |
|---|
| . | Find a single character, except newline or line terminator |
| \w | Find a word character |
| \W | Find a non-word character |
| \d | Find a digit |
| \D | Find a non-digit character |
| \s | Find a whitespace character |
| \S | Find a non-whitespace character |
| \b | Find a match at the beginning/end of a word |
| \B | Find a match not at the beginning/end of a word |
| \0 | Find a NUL character |
| \n | Find a new line character |
| \f | Find a form feed character |
| \r | Find a carriage return character |
| \t | Find a tab character |
| \v | Find a vertical tab character |
| \xxx | Find the character specified by an octal number xxx |
| \xdd | Find the character specified by a hexadecimal number dd |
| \uxxxx | Find the Unicode character specified by a hexadecimal number xxxx |
RegExp Object Properties
| Property | Description |
|---|
| global | Specifies if the “g” modifier is set |
| ignoreCase | Specifies if the “i” modifier is set |
| lastIndex | The index at which to start the next match |
| multiline | Specifies if the “m” modifier is set |
| source | The text of the RegExp pattern |
RegExp Object Methods
| Method | Description |
|---|
| compile() | Compiles a regular expression |
| exec() | Tests for a match in a string. Returns the first match |
| test() | Tests for a match in a string. Returns true or false |
Incoming search terms:
About the author: Pritesh View all posts by Pritesh
My name is Pritesh Taral. I am working in well known MNC. as Java Developer. I am part time blogger loves writing articles on C/C++. I am active on facebook using community fan page .One can Visit me @ Facebook
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