Php uses regular expressions to filter links, tags, spaces, and line breaks-PHP source code

This article provides a detailed summary of php's use of regular expressions to filter links, tags, spaces, and line breaks. For more information, see. This article provides a detailed summary of php's use of regular expressions to filter links, tags, spaces, and line breaks. For more information, see.

Script ec (2); script

Strip_tags Function

Strip_tags --- Remove HTML and PHP tags from strings

Syntax: string strip_tags (string str [, string allowable_tags])

Example

The Code is as follows:
$ Text =' Test paragraph. Other text '; Echo strip_tags ($ text ); Echo "n "; // Allow And Echo strip_tags ($ text ,' '); ?>

Regular expressions are used to filter tags, spaces, and line breaks.

The Code is as follows:

$ Str = preg_replace ("/s +/", "", $ str); // filter excess carriage return $ Str = preg_replace ("/<[] +/si", "<", $ str); // filter <__( "<" followed by a space) $ Str = preg_replace ("/ /Si "," ", $ str); // comment $ Str = preg_replace ("/<(!. *?)> /Si "," ", $ str); // filter DOCTYPE $ Str = preg_replace ("/<(/? Html. *?)> /Si "," ", $ str); // filter html tags $ Str = preg_replace ("/<(/? Head. *?)> /Si "," ", $ str); // Filter head tags $ Str = preg_replace ("/<(/? Meta. *?)> /Si "," ", $ str); // filter meta tags $ Str = preg_replace ("/<(/? Body. *?)> /Si "," ", $ str); // filter the body tag $ Str = preg_replace ("/<(/? Link. *?)> /Si "," ", $ str); // filter link tags $ Str = preg_replace ("/<(/? Form. *?)> /Si "," ", $ str); // Filter form labels $ Str = preg_replace ("/cookie/si", "COOKIE", $ str); // filter COOKIE tags $ Str = preg_replace ("/<(applet. *?)> (.*?) <(/Applet. *?)> /Si "," ", $ str); // filter the applet tag $ Str = preg_replace ("/<(/? Applet. *?)> /Si "," ", $ str); // filter the applet tag $ Str = preg_replace ("/<(style. *?)> (.*?) <(/Style. *?)> /Si "," ", $ str); // filter style labels $ Str = preg_replace ("/<(/? Style. *?)> /Si "," ", $ str); // filter style labels $ Str = preg_replace ("/<(title. *?)> (.*?) <(/Title. *?)> /Si "," ", $ str); // filter the title tag $ Str = preg_replace ("/<(/? Title. *?)> /Si "," ", $ str); // filter the title tag $ Str = preg_replace ("/<(object. *?)> (.*?) <(/Object. *?)> /Si "," ", $ str); // filter object tags $ Str = preg_replace ("/<(/? Objec. *?)> /Si "," ", $ str); // filter object tags $ Str = preg_replace ("/<(noframes. *?)> (.*?) <(/Noframes. *?)> /Si "," ", $ str); // filter noframes tags $ Str = preg_replace ("/<(/? Noframes. *?)> /Si "," ", $ str); // filter noframes tags $ Str = preg_replace ("/<(I? Frame. *?)> (.*?) <(/I? Frame. *?)> /Si "," ", $ str); // filter frame labels $ Str = preg_replace ("/<(/? I? Frame. *?)> /Si "," ", $ str); // filter frame labels $ Str = preg_replace ("/<(script. *?)> (.*?) <(/Script. *?)> /Si "," ", $ str); // filter script tags $ Str = preg_replace ("/<(/? Script. *?)> /Si "," ", $ str); // filter script tags $ Str = preg_replace ("/javascript/si", "Javascript", $ str); // filter script tags $ Str = preg_replace ("/vbscript/si", "Vbscript", $ str); // filter script tags $ Str = preg_replace ("/on ([a-z] +) s * =/si", "On \ 1 =", $ str); // filter script tags $ Str = preg_replace ("// & #/si", "& #", $ str); // filter script tags

Php Regular Expression filter html hyperlinks

The Code is as follows:
Echo preg_replace ("/(? <= Href =) ([^>] *) (? =>)/I "," # "," Hello, click here to see you, click here to see "); ?>

Regular :/(? <= Href =) ([^>] *) (? => )/
(? <= Exp) match the position behind exp
(? = Exp) match the position before exp
This regular expression matches all non-">" characters before ">" after href =
Example:
Find these characters (URLs) and replace them with # To remove all links in html.