Introduction to the differences between PHP regular matching functions_PHP Tutorial

This article introduces the differences between commonly used regular matching functions in PHP. They mainly include str_replace, str_ireplace, substr_replace, preg_replace, preg_match, preg_match_all, preg_quote, preg_split, ereg_replace, eregi_replace, preg_replace, str_split. Of course, some of them cannot use regular expressions, but Because they have an ambiguous relationship with related regular functions, they are all put together for comparison for easy reference.

名称	支持正则	特点	备注
str_replace	X	字符串替换函数，大小写敏感
str_ireplace	X	字符串替换函数，大小写不敏感，支持数组式批量替换	感谢网友franci，提醒添加
substr_replace	X	部分替换字符串函数，可以指定位置index
preg_replace	Y	指定匹配模式进行替换，支持子串引用	优先使用
ereg_replace	Y	指定匹配模式进行替换，大小写敏感，支持子串引用
eregi_replace	Y	指定匹配模式进行替换，大小写不敏感，支持子串引用
ereg	Y	指定模式全文匹配，可以用来匹配判断，或返回匹配数组
preg_match	Y	指定模式匹配一次退出，可以用来是否匹配判断，或使用返回的匹配数组	优先使用
preg_match_all	Y	指定模式全文匹配，一般用来使用返回的匹配数组	优先使用
preg_split	Y	指定匹配模式下正则剖分，如果能用最好还是使用explode或str_split
str_split	X	指定长度剖分字符串，默认单个字符剖分成数组
explode	X	可以指定单个或多个字符剖分字符串，成功则返回数组，例如12345按照34剖分则返回12和5
preg_quote	-	转义正则表达式字符，意思就是为特殊字符加上反斜线，正则表达式的特殊字符包括：. * ? [ ^ ] $ ( ) { } = ! | : -

Additional notes:
1. There are two sets of regular expression function libraries in PHP, with very similar functions:
One set is provided by the POSIX (Portable Operating System Interface of Unix) library, and the functions are named with the ereg_ prefix. The POSIX regular function library is no longer recommended for use.

One set is provided by the PCRE (Perl Compatible Regular Expression) library. The functions are named with the preg_ prefix. It is recommended that you use them first. In PCRE, pattern expressions (i.e. regular expressions) are usually enclosed between two backslashes "/", as in the "/^w $/" style.

2. PHP regular expression functions: match extraction, match replacement

http://www.bkjia.com/PHPjc/486147.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/486147.htmlTechArticleThis article introduces the differences between commonly used regular matching functions in PHP, mainly str_replace, str_ireplace, substr_replace, preg_replace, preg_match, preg_match_all, preg_quote, preg_spli...