Shulou(Shulou.com)06/02 Report--

This article is about 15 practical php regular expressions. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Verify the domain name

Verify that a string is a valid domain name.

$url = "http://komunitasweb.com/"; if (preg_match ('/ ^ (http | https | ftp): / / ([A-Z0-9] [A-Z0-9 steps -] *) (?:. [A-Z0-9] [A-Z0-9 cycles -] *) +): (d +)? / / A-Z0, $url) {echo" Your url is ok. ";} else {echo" Wrong url. ";}

Highlight a word from a string

This is a very useful search result that matches a word in a string and highlights it.

$text = "Sample sentence from KomunitasWeb, regex has become popular in web programming. Now we learn regex. According to wikipedia, Regular expressions (abbreviated as regex or regexp, with plural forms regexes, regexps, or regexen) are written in a formal language that can be interpreted by a regular expression processor"; $text = preg_replace ("/ b (regex) b text I", '1yen, $text); echo $text

Highlight the query results in your WordPress blog, as I just said, the above code can easily search for results, and here is a better way to perform a search to open your file search.php on a WordPress blog, then find the method the_title () and replace it with the following code

Echo $title; Now, just before the modified line, add this code: Save the search.php file and open style.css. Append the following line to it: strong.search-excerpt {background: yellow;}

Get all the pictures from the HTML document

If you ever wanted to get all the pictures on a web page, this code is what you need, and you can easily build a picture download robot.

$images = array (); preg_match_all ('/ (img | src) = ("| |') [^" >] + / media, $data, $media); unset ($data); $data=preg_replace ('/ (img | src) ("|'| =" | =') (. *) / iCom, "$3", $media [0]); foreach ($data as $url) {$info = pathinfo ($url) If (isset ($info ['extension'])) {if (($info [' extension'] = = 'jpg') | | ($info [' extension'] = = 'jpeg') | | ($info [' extension'] = = 'gif') | | ($info [' extension'] = = 'png') array_push ($images, $url);}}

Delete duplicate letters

Do you often re-enter letters? This expression is just right.

$text = preg_replace ("/ s (winters) 1max I", "$1", $text)

Delete duplicate punctuation

The function is the same as above, but it is only a comma repeated in the face of punctuation.

$text = preg_replace ("/. + / I", ".", $text)

Match a XML or HTML tag

This simple function takes two arguments: the first is the tag you want to match, and the second is the variable that contains XML or HTML. Again, this is really powerful.

Function get_tag ($tag, $xml) {$tag = preg_quote ($tag); preg_match_all ('{] * > (. *?).'}', $xml, $matches, PREG_PATTERN_ORDER); return $matches [1];}

Match XML or HTML tags with attribute values

This function is very similar to the above, but it allows you to match tags with attribute values inside, for example, you can easily match

Function get_tag ($attr, $value, $xml, $tag=null) {if (is_null ($tag)) $tag='\ wrought; else $tag= preg_quote ($tag); $attr = preg_quote ($attr); $value = preg_quote ($value); $tag_regex = "/] * $attr\ s =\ s *. "(['\"]) $value\\ 2 [^ >] * > (. *?) / "preg_match_all ($tag_regex, $xml, $matches, PREG_PATTERN_ORDER); return $matches [3];}

Match hexadecimal color values

Another interesting tool for web developers that allows you to match and verify hexadecimal color values.

$string = "# 555555"; if (preg_match ('/ ^ # (: (?: [a-fd] {3}) {1 echo 2}) $/ string) {echo "example 6 successful.";}

Find the page title

This code makes it easy to find and print content between web pages and

$fp = fopen ("http://www.catswhocode.com/blog","r"); while (! feof ($fp)) {$page. = fgets ($fp, 4096);} $titre = eregi (" (. *) ", $page,$regs); echo $regs [1]; fclose ($fp)

Interpret the Apache log

Most websites use famous Apache servers, so if your site is the same, how about using PHP regular expressions to parse apache server logs?

/ / Logs: Apache web server / / Successful hits to HTML files only. Useful for counting the number of page views. '^ ((? # client IP or domain name) S +) ((? # basic authentication) SignorsSecretsS+) [(? # date and time) [^]] +)] s + "(?: GET | POST | HEAD) ((? # file) / [^?"] +?)? ((? # parameters) [^? "] +)? HTTP/ [0-9.] + "s + (? # status code) 200s + ((? # bytes transferred) [- 0-9] +)" ((? # referrer) [^ "] *)" s + ((? # user agent) [^ "] *)" $'/ / Logs: Apache web server / / 404errors only'^ ((? # client IP or domain name) S+) s + ((? # basic authentication) Signors +) [((? # date and time) [^] +)] S + "(?: GET | POST | HEAD) ((? # file) [^?"] +)? ((? # parameters) [^ "] +)? HTTP/ [0-9.] + "s + (? # status code) 404s + ((? # bytes transferred) [- 0-9] +) s + ((? # referrer) [^"] *) "s +" ((? # user agent) [^ "] *)" $'

Use smart quotes instead of double quotes

If you are a printing enthusiast, you will like this regular expression that allows smart quotes instead of double quotes, which is used by WORDPRESS on its content

Preg_replace ('B "b ([^" x84x93x94rn] +) b "x84x93x94rn,'? 1mm, $text)

Verify the complexity of the password

This regular expression will detect whether the input contains 6 or more letters, numbers, underscores and hyphens. Input must contain at least one uppercase letter, one lowercase letter and one number

The copy code is as follows:

'A (? = [- _ a-zA-Z0-9] *? [Amurz]) (? = [- _ a-zA-Z0-9] *? [Amurz]) (? = [- _ a-zA-Z0-9] *? [0-9]) [- _ a-zA-Z0-9] {6,} z'

WordPress: use regular to get pictures on a post

I know that many people are WORDPRESS users, and you may like and be willing to use the image code that is retrieved from the content of the post. To use this code in your BLOG, you just need to copy the following code to one of your files

Automatically generate smiley face pattern

Another method used by WordPress, this code allows you to automatically change the image to a smiley face symbol.

$texte='A text with a smiley'; echo str_replace (': -)','

', $texte)

Remove the link to the picture

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