Replace content with regular expressions PHP, regular expression Replacement php_php tutorial

Replace content with regular expressions PHP, regular expressions replace PHP

The previous project was to have a question-and-answer page, such as inserting an expression into the content of a reply or question. Written in the content is the name of the expression image (and is not with the suffix, such as: f_002.png) expression package placed in the project, I need to remove the content when the name of the expression in the image replaced.

The content that is stored in the database is this: I don't know [f_013] (the last [f_013] is the form of emoticons in the database)

All I need to do is take the content out of the database and process the characters like this [f_013] into the image address, and it's clear that regular expressions are needed here.

1. First, I need to find this string first.

" /(?:\ [) (F_. [0-9] {1,3}) (?:\]) /I";

This regular match will help me find the expression string.

2. When you find it, change the string to the address where the expression image is stored, where a function is used to replace the regular expression.

This is the function: Preg_match_all

Echo preg_replace ("/(?: \ [) (F_. [0-9] {1,3}) (?:\]) /I","", $line ['content']);

$line [' content ']   This is what I took out of the database,

"  This is the image address I'm going to replace, like my picture address.
Here is a very important point of knowledge: "\${1}"   It is the string of expressions stored in the database.


I have a complete code for my replacement here:

   
     $resultarray();      $n Preg_match_all ("/(?:\ [) (F_. [0-9] {1,3}) (?:\]) /i ",$line$result); /* Return to find the number of strings matching the     criteria */if($n$nfalse)/   * If it is 0 or false, it means no expression.
{        echo$line[' content '];     } Else
{     　　echopreg_replace("/(?: \ [) (F_. [0-9] {1,3}) (?:\]) /i "," ",$line[' content ']);     }     ? >

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