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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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