perl $value =~ tr/+/ /;

时间: 2023-10-03 09:07:51 浏览: 76

Using Perl For Web Programming.pdf

Special Edition Using Perl for Web Programming David Harlan, et al. CONTENTS Chapter 1 Perl Overview Perl Origins H Borrowings H Cost and Licensing H Distribution H G Perl Programs Invocation H Command-Line Arguments H Program Layout H G Data Types Scalars H Arrays H Associative Arrays H File Handles H G Special Variables Environment Variables H Program Arguments H Current Line H System Error Messages H G Flow Control Logical Operators H G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (1 of 24) [2/17/2007 1:22:33 PM] Conditional Expressions H Compound Statements H Loops H Labels H Subroutines H Variable Scope H Patterns Regular Expressions H Matching H Substitution H G From Here G Chapter 2 Introduction to CGI Justifying the Use of CGI Reasons for Using Perl H How to Make Perl Do CGI H G Understanding CGI Calling a Script from a Form H Getting Information to the Script H Processing QUERY_STRING into Useful Chunks H Using Regular Expressions tr/// and s/// H Printing the Page H Creating a Script on Your Web Server H Calling a CGI Script Directly H Limiting Data-File Size H Using the Location Header H Using CGI in Server-Side Includes H G From Here G Chapter 3 Advanced Form Processing and Data Storage Using the POST Method Comparing GET and POST H Processing the Information from a POST-Method Form H G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (2 of 24) [2/17/2007 1:22:34 PM] Making Your Perl Code Modular Defining and Calling Subroutines H Using Variable Aliases H G Using DBM Files for Data Storage Opening a DBM File H Assigning Values to a DBM File H Initializing a DBM File H Adding Data to the DBM File H G Using Complex Forms and Storing Related Data Processing the Form Data and Checking the Password H Working Around the Limitations of DBM Files H G From Here G Chapter 4 Advanced Page Output Parsing the DBM File and Printing Pages Printing a Standard Page H Printing User-Designed Pages H G Returning Data to a Form for Further Revision Filling in Text Fields and Selecting List Items H Saving and Editing User-Designed Pages H G From Here G Chapter 5 Searching Searching the Full Text of Your Site Scanning Directories Using a Recursive Subroutine H Using Recursive Subroutines H Processing the Files in Each Directory H G Using an Index Search Indexing Your Web Site into a DBM File H Performing a Search Using the Index File H G Printing the Resulting Pages Returning Pages from the Nonindex Search H Returning Pages from the Index Search H G From Here G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (3 of 24) [2/17/2007 1:22:34 PM] Chapter 6 Using Dynamic Pages Generating HTML Pages G Understanding the CGI Environment and HTML Generation CGI Environment Variables Using the GET Method H CGI Environment Variables Using the POST Method H G Referring the User to Browser-Specific Web Pages G Using Client Pull with Perl G Using Server Push with Perl G From Here G Chapter 7 Dynamic and Interactive HTML Content in Perl and CGI Creating User-Specific Pages Allowing the User to Shop for Options H Building an HTML Document Based on Options H G Using Server-Side Includes Understanding the SSI Commands H Setting up an Environment for Server-Side Includes H Understanding the Commands H G Understanding Shopping Carts Shopping Cart Using Hidden Fields H Shopping Cart Using HTTP Cookies H G From Here G Chapter 8 Understanding Basic User Authentication Basic User Authentication Processes and User IDs H CGI Program Execution H Access Control H User Identification H G User Authentication on the Apache Server Access Restrictions H G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (4 of 24) [2/17/2007 1:22:34 PM] Apache Configuration Files H Configuration Directives H User Administration Adding Users H Deleting Users H Changing Passwords H Adding Users to Groups H Deleting Users from Groups H G From Here G Chapter 9 Understanding CGI Security Understanding the Security Issues Tracing the Chain of Command H Reading Files H Writing to Files H Storing Variables H Losing the Data H G Managing Sessions The Nature of a Session H The Wrapper H Generic Substitutions H Flow Control H G Designing the Sample Application Program Flow H Data Issues H G Implementing the Sample Application Getting Started: The Main Routine H Getting the CGI Values H Reading the Product Data H Invoking a Specific Function H Parsing an HTML File H Initiating a Login H G Logging In and Out Logging In H Validating the User H G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (5 of 24) [2/17/2007 1:22:34 PM] Logging Out H Managing Session Data Storing Session Data H Retrieving Session Data H G Managing the Orders Building an Order H Reviewing the Order H Placing the Order H G Wrapping Up G From Here G Chapter 10 Site Administration Working with Web Server Log Files Generating HTML Output from a Log File H Reviewing the AccessWatch Log Analyzer H G Understanding File Maintenance G Understanding Robots and the Robot-Exclusion Standard G Configuring Some Common Web Servers O'Reilly's WebSite H NCSA httpd H Apache H G Examining Some Other File- and Site-Administration Issues G From Here G Chapter 11 Database Interaction Justifying Perl/Database Interaction G Examining the Database Options DBI and DBD Database Access Modules for Perl 5 H mSQL and mSQLPerl H Oracle RDBMS and Oraperl H Starting a New Message Thread H Listing Threads and Displaying the Contents of a Single Thread H Navigating Through Messages and Posting Replies H G From Here G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (6 of 24) [2/17/2007 1:22:34 PM] Chapter 12 Database Application Using CGI Fundamental Design and Security Issues Advantages and Disadvantages of a Web/RDBMS Interface H Limitations of HTTP in a Database Context H Security Issues H G A Simple Working Example in Perl Accessing a DBMS from Perl H Defining the Database Schema for the Working Example H Searching the Hotlist H Viewing the Detail Record H Submitting Data to the Hotlist H Generating SQL Code to Transfer Submitted Data H G Perl Tools for Web/DBMS Work WDB H Web/Genera H MiniSQL (mSQL) and W3-mSQL H DBI H ODBC Tools H Some Useful Hotlists H G Problem-Solving Debugging H Tuning Performance H G The Future of Web/Database Interfaces G From Here... G Chapter 13 Special Variables $<I<digit>> G $[ G $ACCUMULATOR G $ARG G $ARGV G $BASETIME G $CHILD_ERROR G $DEBUGGING G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (7 of 24) [2/17/2007 1:22:34 PM] $EFFECTIVE_GROUP_ID G $EFFECTIVE_USER_ID G $EVAL_ERROR G $EXECUTABLE_NAME G $FORMAT_FORMFEED G $FORMAT_LINES_LEFT G $FORMAT_LINES_PER_PAGE G $FORMAT_LINE_BREAK_CHARACTERS G $FORMAT_NAME G $FORMAT_PAGE_NUMBER G $FORMAT_TOP_NAME G $INPLACE_EDIT G $INPUT_LINE_NUMBER G $INPUT_RECORD_SEPARATOR G $LAST_PAREN_MATCH G $LIST_SEPARATOR G $MATCH G $MULTILINE_MATCHING G $OFMT G $OS_ERROR G $OUTPUT_AUTOFLUSH G $OUTPUT_FIELD_SEPARATOR G $OUTPUT_RECORD_SEPARATOR G $PERLDB G $PERL_VERSION G $POSTMATCH G $PREMATCH G $PROCESS_ID G $PROGRAM_NAME G $REAL_GROUP_ID G $REAL_USER_ID G $SUBSCRIPT_SEPARATOR G $SYSTEM_FD_MAX G $WARNING G %ENV<variable_name>,<variable_value> G %INC<file-name>,<file-load-status> G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (8 of 24) [2/17/2007 1:22:35 PM] %SIG<signal-name>,<signal-value> G @ARGV G @INC G From Here... G Chapter 14 Operators ! G != G !~ G % G %= G & G && G &&= G &= G * G ** G **= G *= G + (Unary) G + (Binary) G ++ G += G , G - (Unary) G - (Binary) G -- G -= G -> G . G .. G .= G / G /= G < G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (9 of 24) [2/17/2007 1:22:35 PM] << G <<= G <= G <=> G = G == G => G =~ G > G >= G >> G >>= G ? G LIST Operators (Leftward) G LIST Operators (Rightward) G NAMED Unary Operators G TERMs G " G ^ G ^= G and G cmp G eq G ge G gt G le G lt G ne G not G or G x G x= G xor G | G |= G || G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (10 of 24) [2/17/2007 1:22:35 PM] ||= G ~ G From Here... G Chapter 15 Function List -A Compliance H Syntax H Definition H Example H G -B Compliance H Syntax H Definition H Example H G -b Compliance H Syntax H Definition H Example H G -C Compliance H Syntax H Definition H Example H G -c Compliance H Syntax H Definition H Example H G -d Compliance H Syntax H Definition H Example H G endprotoent Compliance H Syntax H Definition H Example H G endpwent Compliance H Syntax H Definition H Example H G endservent Compliance H Syntax H Definition H Example H G eof Compliance H Syntax H Definition H Example H G eval Compliance H Syntax H Definition H Example H G exec Compliance H Syntax H Definition H Example H G local Compliance H Syntax H Definition H G localtime Compliance H Syntax H Definition H Example H G log Compliance H Syntax H Definition H Example H G lstat Compliance H Syntax H Definition H Example H G m// Compliance H Syntax H Definition H Example H G map Compliance H Syntax H Definition H Example H G setpriority Compliance H Syntax H Definition H Example H G setprotoent Compliance H Syntax H Definition H Example H G setpwent Compliance H Syntax H Definition H Example H G setservent Compliance H Syntax H Definition H Example H G setsockopt Compliance H Syntax H Definition H G shift Compliance H Syntax H Definition H Example H G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (11 of 24) [2/17/2007 1:22:35 PM] -e Compliance H Syntax H Definition H Example H G -f Compliance H Syntax H Definition H Example H G -g Compliance H Syntax H Definition H Example H G -k Compliance H Syntax H Definition H Example H G -l Compliance H Syntax H Definition H Example H G -M Compliance H Syntax H Definition H Example H G -O Compliance H Syntax H Definition H Example H G -o G exists Compliance H Syntax H Definition H Example H G exit Compliance H Syntax H Definition H Example H G exp Compliance H Syntax H Definition H Example H G fcntl Compliance H Syntax H Definition H G fileno Compliance H Syntax H Definition H Example H G flock Compliance H Syntax H Definition H G fork Compliance H Syntax H Definition H Example H G format G mkdir Compliance H Syntax H Definition H Example H G msgctl Compliance H Syntax H Definition H G msgget Compliance H Syntax H Definition H G msgrcv Compliance H Syntax H Definition H G msgsnd Compliance H Syntax H Definition H G my Compliance H Syntax H Definition H G next Compliance H Syntax H Definition H Example H G no Compliance H G shmctl Compliance H Syntax H Definition H G shmget Compliance H Syntax H Definition H G shmread Compliance H Syntax H Definition H G shmwrite Compliance H Syntax H Definition H G shutdown Compliance H Syntax H Definition H G sin Compliance H Syntax H Definition H Example H G sleep Compliance H Syntax H Definition H Example H G socket Compliance H G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (12 of 24) [2/17/2007 1:22:35 PM] Compliance H Syntax H Definition H Example H -p Compliance H Syntax H Definition H Example H G -R Compliance H Syntax H Definition H Example H G -r Compliance H Syntax H Definition H Example H G -S Compliance H Syntax H Definition H Example H G -s Compliance H Syntax H Definition H Example H G -T Compliance H Syntax H Definition H Example H G -t Compliance H G Compliance H Syntax H Definition H Example H formline Compliance H Syntax H Definition H Example H G getc Compliance H Syntax H Definition H Example H G getgrent Compliance H Syntax H Definition H Example H G getgrgid Compliance H Syntax H Definition H Example H G getgrname Compliance H Syntax H Definition H Example H G gethostbyaddr Compliance H Syntax H Definition H Example(Perl5 only) H G gethostbyname G Syntax H Definition H Example H oct Compliance H Syntax H Definition H Example H G open Compliance H Syntax H Definition H Example H G opendir Compliance H Syntax H Definition H Example H G ord Compliance H Syntax H Definition H Example H G pack Compliance H Syntax H Definition H Example H G package Compliance H Syntax H Definition H G pipe Compliance H Syntax H G Syntax H Definition H socketpair Compliance H Syntax H Definition H G sort Compliance H Syntax H Definition H Example H G splice Compliance H Syntax H Definition H Example H G split Compliance H Syntax H Definition H Examples H G sprintf Compliance H Syntax H Definition H Example H G sqrt Compliance H Syntax H Definition H Example H G srand Compliance H Syntax H G CONTENTS http://docs.rinet.ru:8080/Using_Perl5_in_Web/ (13 of 24) [2/17/2007 1:22:35 PM] Syntax H Definition H Example H -u Compliance H Syntax H Definition H Example H G -W Compliance H Syntax H Definition H Example H G -w Compliance H Syntax H Definition H Example H G -X Compliance H Syntax H Definition H Example H G -x Compliance H Syntax H Definition H Example H G -z Compliance H Syntax H Definition H Example H G abs Compliance H Syntax H G Compliance H Syntax H Definition H Example H gethostent Compliance H Syntax H Definition H Example H G getlogin Compliance H Syntax H Definition H Example H G getnetbyaddr Compliance H Syntax H Definition H Example H G getnetbyname Compliance H Syntax H Definition H Example H G getnetent Compliance H Syntax H Definition H Example H G getpeername

这行代码的意思是将字符串变量$value中的"+"字符替换为" "（空格）字符。在Perl中，tr函数用于对字符串进行转换，它的第一个参数指定要被替换的字符集，第二个参数指定用来替换的字符集。在这个例子中，"+"字符是要被替换的字符，而" "字符是用来替换的字符。因此，这行代码将字符串中所有的"+"字符替换为" "字符。

阅读全文

perl $value =~ tr/+/ /;

相关推荐

perl intro

Perl 5编程快速参考指南

基于Java的家庭理财系统设计与开发-金融管理-家庭财产管理-实用性强

弹性盒子Flexbox布局.docx

网络财务系统 SSM毕业设计 附带论文.zip

联想电脑的bios设置

1_教务处关于云南师范大学2024年大学生科研训练基金项目立项申报工作的通知 (1).zip

基于Python实现的自然语言处理大作业-方面情感分析+源代码+文档说明+实验报告

基于Python的Web安全扫描软件设计与实现

【java毕业设计】教学质量评价系统源码（ssm+jsp+mysql+说明文档+LW）.zip

【超强组合】基于VMD-龙格库塔优化算法RUN-Transformer-GRU的光伏预测算研究Matlab实现.rar

【小程序+小程序API+后台商城管理+运行指导教程】springboot+mysql实现的供货商城系统

基于 Java 和 Spring 框架的校园物品维修管理系统的开发与设计

【MATLAB代码】二维平面上的TDOA，使用加权最小二乘法，不限制锚点数量（锚点数量>3即可）

【超强组合】基于VMD-鸽群优化算法PIO-Transformer-LSTM的光伏预测算研究Matlab实现.rar

【超强组合】基于VMD-飞蛾扑火优化算法MFO-Transformer-BiLSTM的光伏预测算研究Matlab实现.rar

最新推荐

探索数据转换实验平台在设备装置中的应用

管理建模和仿真的文件

ggflags包的国际化问题：多语言标签处理与显示的权威指南

如何使用MATLAB实现电力系统潮流计算中的节点导纳矩阵构建和阻抗矩阵转换，并解释这两种矩阵在潮流计算中的作用和差异？

使用git-log-to-tikz.py将Git日志转换为TIKZ图形

"互动学习：行动中的多样性与论文攻读经历"

ggflags包的定制化主题与调色板：个性化数据可视化打造秘籍

如何使用Matlab进行风电场风速模拟，并结合Weibull分布和智能优化算法预测风速？

小栗子源码2.9.3版本发布

关系数据表示学习

网络财务系统 SSM毕业设计附带论文.zip