Custom variables in varnish 5.1.2

[sreeranj s]

Hi,

Is there custom variable in varnish 5.1.2, where I can store the regex like
   ^/?(.+?)?/([A-Z0-9]+([_x\
-][A-Z0-9]+)*)/details/?(tab)?/?(features|pictures|specifications|compatible|compatibleaccessories|manuals
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