PYTHON REGULAR EXPRESSIONS (1A and 1B are related to each other, please answer ALL parts)
write and submit a one line file. The line should start with the ^ character and end (on the same line) with the $ character. The contents of that one line should be exactly what you typed-in/tested in the online Regular Expression checker. 
la. (2 pts) Write a regular expression pattem that matches times on a 12-hour clock written in the format hour:minute:second. Here hour can be any one- or two-digit number in the range 1-12 (with no leading 0 allowed); :minute is optional: if present it can be any two-digit number in the range 00-59; :second is optional: if present, it can be any two-digit number in the range 00-59; at the end is a mandatory am/pm indicator Here are a few legal/illegal examples Legal: Should Match 6pm, 6:23pm, 6:23:15am, 12am, 11:03am, 8:40:04pm Illegal: Should Not Match: 6, 06pm, 14pm, 6::pm, 6:60pm, 6:111pm, 6:4pm, 6:04:7pm, 6:23:15:23am Put your answer in repatternl.txt. lb. (3 pts) Write a regular expression patterm that matches the same strings described in part la. But in addition for this patterm, ensure group 1 is the hour; group 2 is the minute (or None if :minute is not present); group 3 is the second (or None if :second is not present); and group 4 is am or pm. For example, if we execute m = re . match (the-pattern, ' 6:23pn') then m. groups() retums ('6', '23', None, 'pm'). There should be no other numbered groups. Hint (2...) creates a parenthesized regular expression that is not numbered as a group. You can write one regular expression for both la and 1b, or you can write a simpler one for la (ignore groups) and then update it for lb by including the necessary groups. Put your answer in repatternlb.txt. la. (2 pts) Write a regular expression pattem that matches times on a 12-hour clock written in the format hour:minute:second. Here hour can be any one- or two-digit number in the range 1-12 (with no leading 0 allowed); :minute is optional: if present it can be any two-digit number in the range 00-59; :second is optional: if present, it can be any two-digit number in the range 00-59; at the end is a mandatory am/pm indicator Here are a few legal/illegal examples Legal: Should Match 6pm, 6:23pm, 6:23:15am, 12am, 11:03am, 8:40:04pm Illegal: Should Not Match: 6, 06pm, 14pm, 6::pm, 6:60pm, 6:111pm, 6:4pm, 6:04:7pm, 6:23:15:23am Put your answer in repatternl.txt. lb. (3 pts) Write a regular expression patterm that matches the same strings described in part la. But in addition for this patterm, ensure group 1 is the hour; group 2 is the minute (or None if :minute is not present); group 3 is the second (or None if :second is not present); and group 4 is am or pm. For example, if we execute m = re . match (the-pattern, ' 6:23pn') then m. groups() retums ('6', '23', None, 'pm'). There should be no other numbered groups. Hint (2...) creates a parenthesized regular expression that is not numbered as a group. You can write one regular expression for both la and 1b, or you can write a simpler one for la (ignore groups) and then update it for lb by including the necessary groups. Put your answer in repatternlb.txt
