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HOME > PHP Manual > ereg - Regular expression match

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ereg_replace

eregi_replace

POSIX Regex Functions

PHP Manual

ereg

(PHP 4, PHP 5)

ereg — Regular expression match

Description

int ereg ( string $pattern , string $string [, array &$regs ] )

Searches a string for matches to the regular expression given in pattern in a case-sensitive way.

Parameters

pattern

Case sensitive regular expression.

string

The input string.

regs

If matches are found for parenthesized substrings of pattern and the function is called with the third argument regs , the matches will be stored in the elements of the array regs .

$regs[1] will contain the substring which starts at the first left parenthesis; $regs[2] will contain the substring starting at the second, and so on. $regs[0] will contain a copy of the complete string matched.

Return Values

Returns the length of the matched string if a match for pattern was found in string , or FALSE if no matches were found or an error occurred.

If the optional parameter regs was not passed or the length of the matched string is 0, this function returns 1.

Examples

Example #1 ereg() example

The following code snippet takes a date in ISO format (YYYY-MM-DD) and prints it in DD.MM.YYYY format:


<?php
if (ereg ("([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})", $date, $regs)) {
    echo "$regs[3].$regs[2].$regs[1]";
} else {
    echo "Invalid date format: $date";
}
?>

Notes

Note: preg_match(), which uses a Perl-compatible regular expression syntax, is often a faster alternative to ereg().

Note: Up to (and including) PHP 4.1.0 $regs will be filled with exactly ten elements, even though more or fewer than ten parenthesized substrings may actually have matched. This has no effect on ereg()'s ability to match more substrings. If no matches are found, $regs will not be altered by ereg().

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