Fix invalid escape sequence '\w' in RegEx due to 'r' missing (#1967)

Ziyao Wang

2024-07-29 9f04fd130c8436b5a23c4c334d8fb7ea11a95ba6

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[submodule "doc"]
    path = doc
    url = https://github.com/gflags/gflags.git
    branch = gh-pages