m{
  ^ [^-+\d.]*
  (?> (    (?# cut and capture)
    [-+]? (?: \.\d+ | \d+ (?: \. \d* )? )
  ) )
  (?!\.)
}x

##</code><code>##

m{
  ^ [^-+\d.]*
  (
    [-+]? (?: \.\d+ | \d+ (?: \. \d* )? )
  )
  (?![.\d])
}x