PHP intercepts strings about problems! Online Knot Sticker

PHP intercepts string problems! Online and other online knot stickers
Yybb_cx.
Yybb_xdf.

Just like the string above. I just need _ back and. Letters in front

For example, the above two I need is CX and xdf what should be done?

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------Solution--------------------

$s =<<
 <>
Yybb_cx.
Yybb_xdf.
html
Preg_match_all ('/_ (. +?) \./s ', $s, $m);
Print_r ($m [1]);

------Solution--------------------

Preg_match ('/_ (. +?) \./s ', $data, $m);
$a = $m [1];  $a is the variable you want.

------Solution--------------------
I don't like the regular, so intercept.

$a = "yybb_cx.";
$a = substr (substr ($a, 5), 0,-1);
echo $a;

------Solution--------------------

$s = ' yybb_cx. ';
Strtok ($s, ' _ ');
$a = strtok ('. ');
echo $a; Cx

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