Syntax
int
ereg ( string pattern, string string [, array ®s] )
Note:
preg_match(), which uses a Perl-compatible
regular expression syntax, is often a faster alternative to
ereg().
Searches a string for matches to the regular
expression given in pattern in a case-sensitive
way.
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.
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().
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.
The following code snippet takes a date in ISO format
(YYYY-MM-DD) and prints it in DD.MM.YYYY format:
Example 1. ereg() example
<?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";
}
?>
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See also eregi(), ereg_replace(),
eregi_replace(), preg_match(),
strpos(), and strstr().