Normal expression function

function PHP is similar to other Cross-platform languages (perhaps Java is not in its column,:)) and has regular expression functionality. PHP3.0 's regular expression functionality is certainly far less than Perl's, but it's still sufficient, with the main functions:

(1) Ereg,eregi

This is a regular expression matching function, the former is case-insensitive, and the latter is irrelevant.

Usage: Ereg (regular expression, string, [match part array name]);

Regular expressions in PHP3.0 are generally similar to those used in grep.

　

(2) Ereg_replace,eregi_replace

These are replacement functions.

Usage:

Ereg_replace (Regular expression, substitution string, original string);

A strtr in the string handler is a "translation" function, similar to the tr/.../.../in Perl,

Usage: STRTR (String, "from", "to");

For example: Strtr ("Aaabb", "AB", "CD") returns to "CCCDD".



(3) Split

It's similar to the explode function, but this time you can split the string at a place that matches a regular expression.

Usage:

Split (regular expression, string, [number of items taken out before]);