search
HomeBackend DevelopmentPHP TutorialPHP study notes--Regular expression example code in PHP textbook (summary)_PHP tutorial

<?<span php 
        </span><span /*</span><span posix扩展正则表达式函数</span><span */</span>
        <span /*</span><span ---------------------------------------------------</span><span */</span>
        <span $ereg</span> = '^[$][[:alpha:]_][[:alnum:]]*'<span ;
        </span><span ereg</span>(<span $ereg</span>,'$_name',<span $register</span>); <span //</span><span 匹配并且存放数组  //eregi()不分大小写</span>
        <span var_dump</span>(<span $register</span>); <span //</span><span 显示数组结构</span>
        
        <span /*</span><span ---------------------------------------------------</span><span */</span>
        <span $ereg</span> = 'tm'<span ;
        </span><span $str</span> = 'hello,tm,Tm,tM'<span ;
        </span><span $rep_str</span>=<span eregi_replace</span>(<span $ereg</span>,'TM',<span $str</span>); <span //</span><span 匹配成功的都用TM替换 ereg_replace() 分大小写</span>
        <span echo</span> <span $rep_str</span><span ;
        
        </span><span /*</span><span ---------------------------------------------------</span><span */</span>
        <span $ereg</span> = 'is'<span ;
        </span><span $str</span> = 'This is a register book.'<span ;
        </span><span $arr_str</span> = <span spliti</span>(<span $ereg</span>,<span $str</span>); <span //</span><span 分割字符串。按正则匹配 split() 分大小写</span>
        <span var_dump</span>(<span $arr_str</span><span );
        
        
        </span><span /*</span><span pcre兼容正则表达式函数  --无论从效率或者语法上pcre都略优于posix</span><span */</span>
        <span /*</span><span ---------------------------------------------------</span><span */</span>
        <span $preg</span> = '/\d{3,4}-?\d{7,8}/'<span ;
        </span><span $arr</span> = <span array</span>('043212345678','0431-7654321','12345678'); <span //</span><span 包含元素数组</span>
        <span $preg_arr</span> = <span preg_grep</span>(<span $preg</span>,<span $arr</span><span );
        </span><span var_dump</span>(<span $preg_arr</span><span );
        
        </span><span /*</span><span ---------------------------------------------------</span><span */</span>
        <span $str</span> = 'This is an example!'<span ;
        </span><span $preg</span> = '/\b\w{2}\b/'<span ;
        </span><span $num1</span> = <span preg_match</span>(<span $preg</span>,<span $str</span>,<span $str1</span>); <span //</span><span 匹配并返回成功个数,把匹配成功的放入数组 成功后,就停止</span>
        <span echo</span> <span $num1</span>."<br />"<span ;
        </span><span var_dump</span>(<span $str1</span><span );
        </span><span echo</span> "<br />"<span ;
        </span><span //</span><span 匹配并返回成功个数,把匹配成功的放入数组 成功后,不停止,直到匹配所有字符结束</span>
        <span $num2</span> = <span preg_match_all</span>(<span $preg</span>,<span $str</span>,<span $str2</span><span ); 
        </span><span echo</span> <span $num2</span>."<br />"<span ;
        </span><span var_dump</span>(<span $str2</span><span );
        
        </span><span /*</span><span ---------------------------------------------------</span><span */</span>
        <span $str</span> = '!、$、^、*、+、.、[、]、\\、/、b、<、>'<span ;
        </span><span $str2</span>='b'<span ;
        </span><span //</span><span 自动将正则特殊字符进行转义,如果有参数,字符中含参数字符也会被转义</span>
        <span $match_one</span> = <span preg_quote</span>(<span $str</span>,<span $str2</span><span ); 
        </span><span echo</span> <span $match_one</span><span ;
        
        </span><span /*</span><span ---------------------------------------------------</span><span */</span>
        <span $string</span> = '[b]粗体字[/b]'<span ;
        </span><span //</span><span 匹配并替换 用了反向引用</span>
        <span $b_rst</span> = <span preg_replace</span>('/\[b\](.*)\[\/b\]/i','<b>$1</b>',<span $string</span><span );
        </span><span echo</span> <span $b_rst</span><span ;
        
        </span><span /*</span><span ---------------------------------------------------</span><span */</span>
        <span function</span> c_back(<span $str</span><span )
        {
            </span><span //</span><span 反向引用</span>
            <span $str</span> = "<font color=<span $str</span>[1]><span $str</span>[2]</font>"<span ;
            </span><span return</span> <span $str</span><span ;
        }
        </span><span $string</span> = '[color=blue]字体蓝色[/color]'<span ;
        </span><span //</span><span preg_replace_callback函数中要替换的字符,换成了回调函数而已和 preg_replace差不多</span>
        <span echo</span> <span preg_replace_callback</span>('/\[color=(.*)\](.*)\[\/color\]/U',"c_back",<span $string</span><span );
        
        </span><span /*</span><span ---------------------------------------------------</span><span */</span>
        <span //</span><span 此函数书上没有,我自己写的示例给大家!</span>
        <span $preg</span> = "/\s+/"; <span //</span><span 这里也可以换成 "/\s{1,}/";</span>
        <span $str</span> = "I'm Chinese! I can eat"<span ;
        </span><span $arr</span> = <span preg_split</span>(<span $preg</span>,<span $str</span>); <span //查找并拆分。--这里有笔误,以前看过的朋友对不住了,现已更正</span>
        <span var_dump</span>(<span $arr</span><span );
    </span>?>

 

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/440339.htmlTechArticle? = '^[$][[:alpha:]_][[:alnum:]]*' ( ,'$_name', ); ( ); = 'tm' = 'hello,tm,Tm,tM' = ( ,'TM', ); = 'is' = 'This is a register book.' = ( , ); ( = '/\d{3,4}-?\d{7,8}/' = ('0432123456...
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
The Continued Use of PHP: Reasons for Its EnduranceThe Continued Use of PHP: Reasons for Its EnduranceApr 19, 2025 am 12:23 AM

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python: Exploring Their Similarities and DifferencesPHP and Python: Exploring Their Similarities and DifferencesApr 19, 2025 am 12:21 AM

PHP and Python are both high-level programming languages ​​that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP and Python: Different Paradigms ExplainedPHP and Python: Different Paradigms ExplainedApr 18, 2025 am 12:26 AM

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP and Python: A Deep Dive into Their HistoryPHP and Python: A Deep Dive into Their HistoryApr 18, 2025 am 12:25 AM

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

Choosing Between PHP and Python: A GuideChoosing Between PHP and Python: A GuideApr 18, 2025 am 12:24 AM

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP and Frameworks: Modernizing the LanguagePHP and Frameworks: Modernizing the LanguageApr 18, 2025 am 12:14 AM

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHP's Impact: Web Development and BeyondPHP's Impact: Web Development and BeyondApr 18, 2025 am 12:10 AM

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

How does PHP type hinting work, including scalar types, return types, union types, and nullable types?How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AM

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values ​​and handle functions that may return null values.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

DVWA

DVWA

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software