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This article uses JavaScript to demonstrate, this does not affect your actual application in the project, because I provide the idea, you can easily put it in your own language to implement, which is usually the background language, and the following provides the regular expression you can almost completely copy, because the regular expression is generic.
Webflash
Source: http://webflash.cnblogs.com
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If you have a Web site project, you need to provide a message portal, you use only the ordinary multi-line text box (textarea) for the collection of message content, do not like users to enter some HTML tags, or even script. Like below I Douban in the film review release, if you do not join the process, directly into the database, and finally in the page output display you also directly read the contents of the database, you will see all the original intent to fragment the text is linked together, if the text box content also contains HTML tags, also shows the effect. Believe that this is not your effect, so you have to find a way to change the line in the textarea "\ n" to "<br/>" for the final display of the page, the corresponding surface-to-air grid (full-width space can not be processed, I found that 163 of blogs do this) and the angle brackets of the HTML tags are also converted, which makes it easy to think of a method of finding replacements.
Second, the optimization programIf the information is posted to the <br/> and then into the database, so that when the page is displayed, read the library and display it directly, but if you want to edit the previous information, you have to read from the database containing the content of the <br/> <br/ > turns to \ n in the document box (TEXTAREA) to display as normal for modification. Seems to be dealing with a few steps.
Another way is to release the time is not processed, then this message is not processed when it is edited, but before the page display to the <BR/>, but I think this method is not optimized, the overall performance of the program has a certain impact, because the conversion to be replaced with regular expressions, is to make the program slow, and when the content is published, a lot of people read this message, each user requests for the server to be converted once (unless you generate a static page at the time of publication), and the number of publishing and editing is much less than the number of visits outside, so I recommend the first method.
A city example and source codeHere is an experimental tool that I wrote in JavaScript and you can try it.
Source Download: text box retention format. rar
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "><1> conversion effect is not enabled:
<2> Enable conversion effects:
Preserves line wrapping and space styles for multiline text boxes and escapes the angle brackets of HTML tags
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