METARs are reports assembled with a particular format that is easy to decode with computer systems using regular expressions.

These reports typically come in two forms: North American METARs and International METARs. Create a series of regular expressions that decode each token of information using the North American METAR form.

You can find METAR reports at the following address:

http://weather.noaa.gov/weather/metar.shtml.

In order to find the weather information you need to get a METAR report from any airport you wish utilizing the appropriate code (Baltimore-Washington International is KBWI) and then apply the different regular expressions to identify each token and eventually extract it from the report.

Your submission should be a script that reads a single line METAR from a file named: metar.txt Your script output (to the shell screen) should include:

the report type: either METAR or SPECI for Special Report

the station identifies (four characters starting with a K)

Day of the month and time the report was filed

If the token AUTO is present, you should output This is a fully automated report

If the token COR is present, you should output This is a corrected observation

Wind direction and speed, wind gusting, and variable wind directions

Visibility in statute miles

Light, medium, or heavy rain (-RA|RA|+RA)

Cloud Conditions: [0 or more occurrences of each of the following]

Sky Clear

Few Clouds

Scattered Clouds

Broken Clouds

Overcast Clouds

Temperature

Dew Point

Barometric Pressure

If the token TH is present, you should output Thunderstorms reported in the area