after ('@', 'biohazard@online.ge');
returns 'online.ge'
from the first occurrence of '@'

before ('@', 'biohazard@online.ge');
returns 'biohazard'
from the first occurrence of '@'

between ('@', '.', 'biohazard@online.ge');
returns 'online'
from the first occurrence of '@'

after_last ('[', 'sin[90]*cos[180]');
returns '180]'
from the last occurrence of '['

before_last ('[', 'sin[90]*cos[180]');
returns 'sin[90]*cos['
from the last occurrence of '['

between_last ('[', ']', 'sin[90]*cos[180]');
returns '180'
from the last occurrence of '['

function after ($this, $inthat)
{
if (!is_bool(strpos($inthat, $this)))
return substr($inthat, strpos($inthat,$this)+strlen($this));
};

function after_last ($this, $inthat)
{
if (!is_bool(strrevpos($inthat, $this)))
return substr($inthat, strrevpos($inthat, $this)+strlen($this));
};

function before ($this, $inthat)
{
return substr($inthat, 0, strpos($inthat, $this));
};

function before_last ($this, $inthat)
{
return substr($inthat, 0, strrevpos($inthat, $this));
};

function between ($this, $that, $inthat)
{
return before($that, after($this, $inthat));
};

function between_last ($this, $that, $inthat)
{
return after_last($this, before_last($that, $inthat));
};

// USES
function strrevpos($instr, $needle)
{
$rev_pos = strpos (strrev($instr), strrev($needle));
if ($rev_pos===false) return false;
else return strlen($instr) - $rev_pos - strlen($needle);
};

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