Path template variables not correctly parsed with dot

Bug description

Path template variables are not parsed/populated correctly when using a dot (.) as seperator between placeholders as in /dot/<foo>.<bar>/.

When using /dot/<foo>.<bar>/ as path template, a request to /dot/abc.def should result in a call to layout(foo='abc', bar='def').
Instead there is a call to layout(foo='abc.de', part=None). (Note the missing e at the end)

Using /dash/<foo>-<bar>/ as path template, the request url is handled as expected and variables are parsed/populated correctly.

Expected behavior

Variables should be parsed as expected and correctly independent of characters between seperators.

Minimal example

import dash
from dash import Dash, html, dcc


app = Dash(__name__, use_pages=True, pages_folder="")
dash.register_page(
    "Dot",
    layout=lambda foo=None, bar=None: html.H1([html.B(foo), html.I(bar)]),
    path_template='/dot/<foo>.<bar>'
)

dash.register_page(
    "Dash",
    layout=lambda foo=None, bar=None: html.H1([html.B(foo), html.I(bar)]),
    path_template='/dash/<foo>-<bar>'
)

app.layout = html.Div(
    [
        html.H1("App"),
        html.Div([
            html.Div(dcc.Link(f"{page['name']} - {page['path']}", href=page["path"]))
            for page in dash.page_registry.values()
        ]),
        html.Hr(),
        dash.page_container,
    ]
)

if __name__ == "__main__":
    app.run_server(debug=True)

Environment

dash                2.8.1

Inizia con l'esempio minimo di Dash e confronta la route /dot/<foo>.<bar> con la route funzionante /dash/<foo>-<bar>. Traccia il modo in cui le variabili di path_template vengono analizzate e valorizzate, quindi verifica che una richiesta a /dot/abc.def produca foo='abc' e bar='def' senza introdurre regressioni nei segnaposto separati da trattini.