Sideway
output.to from Sideway
Draft for Information Only

Content

Regular Expression
  Regular Expression Engine
  Regular Expression Features
   Special Characters

Regular Expression

Regular expression is a technology of using an expression to compare with the text being searched. The expression used for comparing is a pattern of characters which are constructed following some rules and regulation. By matching the expression with the text string, regular expression can be used to search for patterns in the text, to replace strings of the text and to extract substrings of the text.

Regular Expression Engine

 

Regular Expression Features

The features of patterns used in regular expression can be grouped into serveral categories.

Special Characters

To a regular expression engine, special characters are metacharacters that represents a special meaning instead of the literal letter itself. Double quotes " and slash / are used as the delimiters of a literal regular exression pattern in VBScript and JScript accordingly. Backslash \ is a universal praser of a token. Asterisk *, plus +, question mark ?, dollar $, period ., opening bracket [, closing bracket ], opening brace {, closing brace }, open parenthesis (, close parenthesis ), vertical bar |,  are special control characters of a regular expression pattern. Hyphen - is a special control character of a character set. While caret ^ is a special control character for both a regular expression pattern and a regular character set with two different meanings accordingly.


©sideway

ID: 160800014 Last Updated: 8/11/2016 Revision: 0


Latest Updated LinksValid XHTML 1.0 Transitional Valid CSS!Nu Html Checker Firefox53 Chromena IExplorerna
IMAGE

Home 5

Business

Management

HBR 3

Information

Recreation

Hobbies 8

Culture

Chinese 1097

English 339

Reference 79

Computer

Hardware 224

Software

Application 213

Digitization 32

Latex 52

Manim 204

KB 1

Numeric 19

Programming

Web 289

Unicode 504

HTML 66

CSS 65

SVG 46

ASP.NET 270

OS 429

DeskTop 7

Python 72

Knowledge

Mathematics

Formulas 8

Algebra 84

Number Theory 206

Trigonometry 31

Geometry 33

Coordinate Geometry 2

Calculus 67

Complex Analysis 21

Engineering

Tables 8

Mechanical

Mechanics 1

Rigid Bodies

Statics 92

Dynamics 37

Fluid 5

Fluid Kinematics 5

Control

Process Control 1

Acoustics 19

FiniteElement 2

Natural Sciences

Matter 1

Electric 27

Biology 1

Geography 1


Copyright © 2000-2022 Sideway . All rights reserved Disclaimers last modified on 06 September 2019