{name_b param_v="wh"}
{name_a param_x="abc" param_a="fsd" param_y="def"}
{name_z param_sd="zka" param_s="df"}
{name_a param_y="wtf" param_z="kro" param_c="ptz" param_ch="www"}

##</code><code>##

{name_b param_v="wh"}
{name_a param_x="abc" param_y="def"}
{name_z param_sd="zka" param_s="df"}
{name_a param_y="wtf"}

##</code><code>##

s/(\{name_a[^}]+?)\w+(?<!param_x|param_y)="[^"]+"/$1/g;