List of specials is incomplete:

--- sample code ---

$specials = '.\+*?[^]$(){}=!<>|:-';

for ($i = 0; $i <= 255; $i++) {

if (chr($i) !== preg_quote(chr($i))) {

printf("Character 0x%02x quoted%s\n",

$i,

(strpos($specials, chr($i)) === FALSE) ? ' (+)' : '');

} /* if */

} /* for */

--- sample code ---

--- output ---

Character 0x00 quoted (+)

Character 0x21 quoted

Character 0x24 quoted

Character 0x28 quoted

Character 0x29 quoted

Character 0x2a quoted

Character 0x2b quoted

Character 0x2d quoted

Character 0x2e quoted

Character 0x3a quoted

Character 0x3c quoted

Character 0x3d quoted

Character 0x3e quoted

Character 0x3f quoted

Character 0x5b quoted

Character 0x5c quoted

Character 0x5d quoted

Character 0x5e quoted

Character 0x7b quoted

Character 0x7c quoted

Character 0x7d quoted

--- output ---

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