php 简单的 preg_replace
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Simple preg_replace
提问by bluedaniel
I cant figure out preg_replace at all, it just looks chinese to me, anyway I just need to remove "&page-X" from a string if its there.
我根本无法弄清楚 preg_replace ，它对我来说只是中文，无论如何我只需&page-X要从字符串中删除“ ”，如果它在那里。
Xbeing a number of course, if anyone has a link to a useful preg_replacetutorial for beginners that would also be handy!
X当然，如果有人有指向preg_replace初学者有用教程的链接，那也会很方便！
回答by Ferdinand Beyer
Actually the basic syntax for regular expressions, as supported by preg_replaceand friends, is pretty easy to learn. Think of it as a string describing a pattern with certain characters having special meaning.
实际上，正则表达式的基本语法，正如preg_replace朋友们所支持的那样，非常容易学习。将其视为描述具有特殊含义的某些字符的模式的字符串。
In your very simple case, a possible pattern is:
在您非常简单的情况下，可能的模式是：
&page-\d+
With \dmeaning a digit (numeric characters 0-9) and +meaning: Repeat the expression right before +(here: \d) one or more times. All other characters just represent themselves.
有了\d这意味着一个数字（数字字符0-9）和+意为：前重复表达权+（此处\d）一次或多次。所有其他角色只代表他们自己。
Therefore, the pattern above matches any of the following strings:
因此，上面的模式匹配以下任何字符串：
&page-0
&page-665
&page-1234567890
Since the pregfunctions use a Perl-compatible syntax and regular expressions are denoted between slashes (/) in Perl, you have to surround the pattern in slashes:
由于preg函数使用与 Perl 兼容的语法，并且正则表达式/在 Perl中用斜线 ( )表示，因此您必须将模式括在斜线中：
$after = preg_replace('/&page-\d+/', '', $before);
Actually, you can use other characters as well:
实际上，您也可以使用其他字符：
$after = preg_replace('#&page-\d+#', '', $before);
For a full reference of supported syntax, see the PHP manual.
有关受支持语法的完整参考，请参阅PHP 手册。
回答by Gumbo
preg_replaceuses Perl-Compatible Regular Expressionfor the search pattern. Try this pattern:
preg_replace使用Perl 兼容的正则表达式作为搜索模式。试试这个模式：
preg_replace('/&page-\d+/', '', $str)
See the pattern syntaxfor more information.
有关更多信息，请参阅模式语法。
回答by Marius
回答by TigerTiger
preg_replace('/&page-\d+/', '', $string)
Useful information:
有用的信息：
Using Regular Expressions with PHP
http://articles.sitepoint.com/article/regular-expressions-php
http://articles.sitepoint.com/article/regular-expressions-php
