Quantifiers for Matching a Recurring Character : Regular Expressions « String « PHP

1.	Chart
2.	Class
3.	Components
4.	Cookie Session
5.	Data Structure
6.	Data Type
7.	Date
8.	Design Patterns
9.	Development
10.	DNS
11.	Email
12.	File Directory
13.	Form
14.	Functions
15.	Graphics Image
16.	HTML
17.	Language Basics
18.	Login Authentication
19.	Math
20.	MySQL Database
21.	Network
22.	Operator
23.	PDF
24.	Reflection
25.	Statement
26.	String
27.	Utility Function
28.	Web Services SOAP WSDL
29.	XML

Java Source Code / Java Documentation

Java Open Source

Jar File Download

Photoshop Tutorials

Flash Tutorials

3ds-Max Tutorials

Illustrator Tutorials

C# / CSharp Tutorial

C# / CSharp Open Source

ASP.NET Tutorial

JavaScript DHTML

JavaScript Tutorial

JavaScript Reference

HTML CSS Reference

Python Tutorial

Python Open Source

SQL Server / T-SQL

SQL Server / T-SQL Tutorial

Oracle PL / SQL

Oracle PL/SQL Tutorial

VB.Net Tutorial

Flash / Flex / ActionScript

VBA / Excel / Access / Word

Microsoft Office PowerPoint 2007 Tutorial

Microsoft Office Excel 2007 Tutorial

Microsoft Office Word 2007 Tutorial

PHP » String » Regular Expressions

Quantifiers for Matching a Recurring Character


 

Symbol         Description                                      Example

 

*              Zero or more instances                           a*

 

+              One or more instances                            a+

 

?              Zero or one instance                             a?

 

{n}            n instances                                      a{3}

 

{n,}           At least n instances                             a{3,}

 

{,n}           Up to n instances                                a{,2}

 

{n1, n2}       At least n1 instances, no more than n2 instances a{1,2}

Related examples in the same category

1.	Brackets [] finds a range of characters.
2.	Character Classes
3.	Complete list of regular expression examples
4.	\b and \B, equate to "On a word boundary" and "Not on a word boundary," respectively.
5.	^ and $ are line anchors.
6.	Line Anchors
7.	Match URL
8.	Match an IP address
9.	Match the smallest number of characters starting with "p" and ending with "t"
10.	Matching GUIDs/UUIDs
11.	Matching a Valid E-mail Address
12.	Matching a Valid IP Address
13.	Matching using backreferences
14.	Matching with Greedy vs. Nongreedy Expressions
15.	Matching with character classes and anchors
16.	Matching with \|
17.	Define a pattern and use parentheses to match individual elements within it
18.	Greedy Qualifiers
19.	Greedy and non-greedy matching
20.	Greedy versus nongreedy matching
21.	Grouping captured subpatterns
22.	Validating Pascal Case Names
23.	Validating U.S. Currency
24.	Validating a credit card number
25.	Nongreedy Qualifiers
26.	POSIX Regular Expressions Character Classes
27.	POSIX Regular Expressions Character Classes
28.	Ranges
29.	Option patterns:
30.	Predefined Character Ranges (Character Classes)
31.	Pattern matches:
32.	Pattern match extenders:
33.	Perl-Compatible Regular Expressions (PCRE)
34.	Qualifiers restrict the number of times the preceding expression may appear.
35.	Quantifiers: +, *, ?, {int. range}, and $ follow a character sequence:
36.	Special classes for regular expression
37.	Regular expressions using character classes

www.java2java.com | Contact Us

Copyright 2009 - 12 Demo Source and Support. All rights reserved.

All other trademarks are property of their respective owners.