PHP preg_replace/preg_match vs PHP str_replace
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PHP preg_replace/preg_match vs PHP str_replace
提问by benhowdle89
Can anyone give me a quick summary of the differences please?
任何人都可以给我一个差异的快速总结吗？
To my mind they both do the same thing?
在我看来，他们都做同样的事情？
Thanks
谢谢
回答by mingos
str_replacereplaces a specific occurrence of a string, for instance "foo" will only match and replace that: "foo". preg_replacewill do regular expression matching, for instance "/f.{2}/" will match and replace "foo", but also "fey", "fir", "fox", "f12", etc.
str_replace替换字符串的特定出现，例如“foo”只会匹配并替换它：“foo”。preg_replace将进行正则表达式匹配，例如“/f.{2}/”将匹配并替换“foo”，但也会匹配和替换“fey”、“fir”、“fox”、“f12”等。
[EDIT]
[编辑]
See for yourself:
你自己看：
$string = "foo fighters";
$str_replace = str_replace('foo','bar',$string);
$preg_replace = preg_replace('/f.{2}/','bar',$string);
echo 'str_replace: ' . $str_replace . ', preg_replace: ' . $preg_replace;
The output is:
输出是：
str_replace: bar fighters, preg_replace: bar barhters
str_replace：酒吧战士，preg_replace：酒吧barhters
:)
:)
回答by Jon
str_replacewill just replace a fixed string with another fixed string, and it will be much faster.
str_replace只会用另一个固定字符串替换一个固定字符串，它会快得多。
The regular expression functions allow you to search for and replace with a non-fixedpattern called a regular expression. There are many "flavors" of regular expression which are mostly similar but have certain details differ; the one we are talking about here is Perl Compatible Regular Expressions (PCRE).
正则表达式函数允许您搜索和替换称为正则表达式的非固定模式。正则表达式有很多“风味”，它们大多相似，但在某些细节上有所不同；我们在这里谈论的是 Perl 兼容正则表达式 ( PCRE)。
If they look the same to you, then you should use str_replace.
如果它们在您看来相同，那么您应该使用str_replace.
回答by Mārti?? Briedis
str_replacesearches for pure text occurences while preg_replacefor patterns.
str_replace搜索纯文本出现，同时preg_replace搜索模式。
