12-hour to 24-hour clock conversion

[guy038]

Hi, all,

As the (?...:....) regex structure, of the Boost regex library is not so common, you may feel a bit lost about the replacement regex syntax !

So, here is, below, the algorithmic translation of the replacement regex, of my previous post :

If group 13 exists    #  Case hour = '12'

    then

        If group 17 exists    #  String 'AM' or 'am', after the digits
  
            then

                Write the string '00'

            else

                Rewrite the group 1 contents    #  Actually, the hour '12'

    else

        If group 17 exists    #  String 'AM' or 'am', after the digits

            then

                Rewrite the group 1 contents    #  The 'hour' digits, so the values  '01'  or  '02'  or  ...... '11'

            else    #  The 'hour' digits, when followed with the string 'PM' or 'pm'

                If group  2 exists then write the string '13'    #  Case hour = '01'

                If group  3 exists then write the string '14'    #  Case hour = '02'

                If group  4 exists then write the string '15'    #  Case hour = '03'

                If group  5 exists then write the string '16'    #  Case hour = '04'

                If group  6 exists then write the string '17'    #  Case hour = '05'

                If group  7 exists then write the string '18'    #  Case hour = '06'

                If group  8 exists then write the string '19'    #  Case hour = '07'

                If group  9 exists then write the string '20'    #  Case hour = '08'

                If group 10 exists then write the string '21'    #  Case hour = '09'

                If group 11 exists then write the string '22'    #  Case hour = '10'

                If group 12 exists then write the string '23'    #  Case hour = '11'

       endif

endif

Write the string ':'

Rewrite the group 14    #  Minutes digits

Write the string ':'

Rewrite the group 15    #  Seconds digits

if group 16 exits       #  Milleseconds digits

    then

        write the string ':'

        write the group 16 contents    # Milleseconds digits
endif

BR

guy038