CF7: Array values with regular Expressions inside a PHP Script [duplicate] - php

Question

I have two patterns and i want to search them in a string.
they are like this:
$pattern = '/,3$/'
$pattern = '/^1,/';
actually I want to find strings that start with 1, OR end with ,3
My strings are in this format:
a => 1,2
b => 31,2
c => 4,3
for example a and c are matches!
how can I use preg_match to check this patterns?
tanks for helps.

Answer 1

Try it this way
preg_match("/^1,|,3$/", $string)

Answer 2

/(^1,)|(,3$)/ should work for you.

Answer 3

Just in case some day you will need a non-regex solution, you can use the following startswith and endswith functions:
function startsWith($haystack, $needle) {
// search backwards starting from haystack length characters from the end
return $needle === "" || strrpos($haystack, $needle, -strlen($haystack)) !== FALSE;
}
function endsWith($haystack, $needle) {
// search forward starting from end minus needle length characters
return $needle === "" || (($temp = strlen($haystack) - strlen($needle)) >= 0 && strpos($haystack, $needle, $temp) !== FALSE);
}
if (startsWith("1,2", "1,") || endsWith("1,2", ",3"))
echo "True1". "\n";
if (startsWith("31,2", "1,") || endsWith("31,2",",3"))
echo "True2". "\n";
if (startsWith("4,3", "1,") || endsWith("4,3",",3"))
echo "True3" . "\n";
Output of the IDEONE demo:
True1
True3