Trouble with regexp

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Context

Up to date TeX Live 2017 distribution

Problem

The problem is pointed out by e.g.:

$ texdef -V
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/^\\\@protected\@testopt { <-- HERE ?\\.*? }? *(\\\\.*?) / at /usr/local/bin//texdef line 391.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/^\\\@testopt { <-- HERE ?(\\.*?) }?/ at /usr/local/bin//texdef line 394.
texdef: Version 1.7b -- 2012/05/15

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