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module TelHelper
# Erstellt einen <a href="tel:..."> link.
def tel_to(telephone_number, name = nil, html_options = {})
href = html_escape telephone_number.to_s.strip.sub(/\A\+/, '00').gsub(/(\(.+\))/, '').gsub(/[^\d]/, '')
content_tag "a", name || telephone_number, html_options.stringify_keys.merge("href" => "tel:#{href}".html_safe)
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