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{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_ch="www"}

s/
(?:\{name_a | \G)
...
\w++(?<!param_[xy])
="[^"]+"
//xg;