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<?php $string = '{\rtlch\fcs1 \af56 \ltrch\fcs0 \i\f56\insrsid13383763\charrsid4210380 \\\'e1}'; echo preg_replace('#\{\\rtlch\\fcs1 \\af56 \\ltrch\\fcs0 \\i\\f56\\insrsid13383763\\charrsid4210380( \\\'e1)\}#', '$1', $string);

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