JavaScript RegExp Object
RegExp, is short for regular expression.
Complete RegExp Object Reference
For a complete reference of all the properties and methods that can be used with the RegExp object,
go to our complete RegExp object reference.
The reference contains a brief description and examples of use for each property and method!
What is RegExp?
A regular expression is an object that describes a pattern of characters.
When you search in a text, you can use a pattern to describe what you are searching for.
A simple pattern can be one single character.
A more complicated pattern can consist of more characters, and can be used for parsing, format checking, substitution and more.
Regular expressions are used to perform powerful pattern-matching and "search-and-replace" functions on text.
Syntax
var txt=new RegExp(pattern,modifiers);
or more simply:
var txt=/pattern/modifiers;
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- pattern specifies the pattern of an expression
- modifiers specify if a search should be global, case-sensitive, etc.
RegExp Modifiers
Modifiers are used to perform case-insensitive and global searches.
The i modifier is used to perform case-insensitive matching.
The g modifier is used to perform a global match (find all matches rather than stopping after the first match).
Example 1
Do a case-insensitive search for "w3schools" in a string:
var str="Visit W3Schools";
var patt1=/w3schools/i;
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The marked text below shows where the expression gets a match:
Try it yourself »
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Example 2
Do a global search for "is":
var str="Is this all there is?";
var patt1=/is/g; |
The marked text below shows where the expression gets a match:
Try it yourself »
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Example 3
Do a global, case-insensitive search for "is":
var str="Is this all there is?";
var patt1=/is/gi; |
The marked text below shows where the expression gets a match:
Try it yourself »
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test()
The test() method searches a string for a specified value, and returns true
or false, depending on the result.
The following example searches a string for the character "e":
Example
var patt1=new RegExp("e"); document.write(patt1.test("The best things in life are free")); |
Since there is an "e" in the string, the output of the code above will be:
Try it yourself »
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exec()
The exec() method searches a string for a specified value, and
returns the text of the found value. If no match is found, it returns null.
The following example searches a string for the character "e":
Example 1
var patt1=new RegExp("e"); document.write(patt1.exec("The best things in life are free")); |
Since there is an "e" in the string, the output of the code above will be:
Try it yourself »
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