$tt = "Event: Dial  Privilege: call,all  SubEvent: Begin  Channel: Local/0267@from-queue-2962;2  Destination: SIP/601-00001bca  CallerIDNum: 07016317212  CallerIDName: rc07016317212  ConnectedLineNum: 0267  ConnectedLineName: 0267  UniqueID: 1339380988.50590  DestUniqueID: 1339380988.50591  Dialstring: 601";
preg_match("/(CallerIDNum:\s+\d+)\s+.+(UniqueID:\s\d+\.\d+)/",$tt,$out, PREG_OFFSET_CAPTURE,3);

$tt = "Event: Dial  Privilege: call,all  SubEvent: Begin  Channel: Local/0267@from-queue-2962;2  Destination: SIP/601-00001bca  CallerIDNum: 07016317212  CallerIDName: rc07016317212  ConnectedLineNum: 0267  ConnectedLineName: 0267  UniqueID: 1339380988.50590  DestUniqueID: 1339380988.50591  Dialstring: 601";
preg_replace('/(\w+):\s+([^\s]+)/e','$ar[$1]="$2"',$tt);//quit();
print_r($ar);

------解决方案--------------------
PHP code
[User:root Time:13:15:35 Path:/home/liangdong/php]$ cat preg.php 
<?php
$str = "Event: Dial  Privilege: call,all  SubEvent: Begin  Channel: Local/0267@from-queue-2962;2  Destination: SIP/601-00001bca  CallerIDNum: 07016317212  CallerIDName: rc07016317212  ConnectedLineNum: 0267  ConnectedLineName: 0267  UniqueID: 1339380988.50590  DestUniqueID: 1339380988.50591  Dialstring: 601";
$nmatches = preg_match_all('/(CallerIDNum|CallerIDName|ConnectedLineNum|ConnectedLineName|UniqueID|DestUniqueID|Dialstring): (\S+)/', $str, $matches);
print_r($matches);
?>
[User:root Time:13:15:36 Path:/home/liangdong/php]$ php preg.php 
Array
(
    [0] => Array
        (
            [0] => CallerIDNum: 07016317212
            [1] => CallerIDName: rc07016317212
            [2] => ConnectedLineNum: 0267
            [3] => ConnectedLineName: 0267
            [4] => UniqueID: 1339380988.50590
            [5] => DestUniqueID: 1339380988.50591
            [6] => Dialstring: 601
        )

    [1] => Array
        (
            [0] => CallerIDNum
            [1] => CallerIDName
            [2] => ConnectedLineNum
            [3] => ConnectedLineName
            [4] => UniqueID
            [5] => DestUniqueID
            [6] => Dialstring
        )

    [2] => Array
        (
            [0] => 07016317212
            [1] => rc07016317212
            [2] => 0267
            [3] => 0267
            [4] => 1339380988.50590
            [5] => 1339380988.50591
            [6] => 601
        )

)

------解决方案--------------------
把我的\S+改成\S*即可。