need a regular expression hint

I am putting the finishing touches on the new formatter,

    > but I need to figure out how to do a regular expression
    > that will match each of these strings:

    > r'10' r'\+7\.3567\{\\times\}10' r'\-5\.740977777\{\\times\}10'
    > r'\{\\times\}10'

Rather than trying to craft the mother of all regexes, you may want o
make a series of them. Iterate over the series and if one matches,
use it.

JDH