PHP Common string regular substitution and split function comparison _php tutorial

This article is to introduce PHP common string regular substitution and split function comparison, in PHP string regular replacement is probably: 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 functions, let me introduce to you.

Regular function relationship ambiguous so all put together to compare, convenient reference.

Name	Support Regular	Characteristics	Note
Str_replace	X	String substitution function, case sensitive
Str_ireplace	X	String substitution function, case insensitive, array-type batch substitution support	Thank netizens Franci, remind to add
Substr_replace	X	Partial substitution string function, you can specify the position index
Preg_replace	Y	Specifying a matching pattern for substitution, supporting substring references	Priority use
Ereg_replace	Y	Specify matching pattern for substitution, case sensitivity, support for substring references
Eregi_replace	Y	Specifies that the matching pattern is replaced, case insensitive, and supports substring references
Ereg	Y	Specifies the pattern full-text match, which can be used to match the judgment, or return a matching array
Preg_match	Y	Specifies whether the pattern matches one exit, which can be used to match the judgment, or to use the returned matching array	Priority use
Preg_match_all	Y	Specifies a pattern full-text match, typically used to return a matching array	Priority use
Preg_split	Y	Specifies the regular split in the matching mode, if it is best to use explode or str_split
Str_split	X	Specifies the length of the split string, by default a single character split into an array
Explode	X	You can specify a single or multiple character splitting string, and a successful return array, for example, 12345 returns 12 and 5 according to the 34 split
Preg_quote	-	Escape regular expression characters, meaning that special characters are prefixed with backslashes, and special characters for regular expressions include:. + * ? [ ^ ] $ ( ) { } = ! < > | : -

Additional notes:

1, there are two sets of regular expression function library in PHP, the function is very similar:

The set is provided by the POSIX (portable Operating System Interface of Unix) library, which is named after the Ereg_ prefix and isno longer recommended for POSIX regular libraries .

The set is provided by the Pcre (Perl Compatible Regular Expression) library, which is named after the Preg_ prefix and is recommended for priority use. In pcre, a pattern expression (that is, a regular expression) is typically included between two backslashes "/", such as the "/^w+$/" style.

2, PHP Regular expression function: matching extraction, matching replacement.

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