$\eval{\forall
                {\del
                        {\tau, x_{L}}
                }
      }_{\tau\in T}$

\right |_{\tau\in T}

\documentclass{article}
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\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english, russian]{babel}
%math
\usepackage{amsmath}
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\begin{document}
\centering
\[  \forall{\left. \del{\tau, x_{L}} \right |_{\tau\in T}} \]
$\eval{\forall{\del{\tau, x_{L}} }}_{\tau\in T}$
\end{document}

\big, \Big, \biggl, \Bigg