Does anyone know a regular expression to validate MSISDN-format mobile numbers?

This should do -- I'm not sure how much more generic you can get:

/^[1-9][0-9]{10,14}$/

To check a number to belong to a particular country, modify the pattern to preface the country code, and then adjust the remaining digits to match:

/^(873[1-9][0-9]{7,11}|91[1-9][0-9]{8,12})$/    #  India
/^46[1-9][0-9]{8,12}$/                          # Sweden

  /^[1-9][0-9]{10,14}$/

The shortest international phone number is only 7 digits long, e.g. +247 2468.

  /^[1-9]\d{6,14}$/

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