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Here are some common low-level expressions that may be useful in jump-starting parser development:
Parse actions:
convertToInteger
    convertToFloat
    convertToDate
    convertToDatetime
    stripHTMLTags
    upcaseTokens
    downcaseTokens
    Example:
   pyparsing_common.number.runTests('''
       # any int or real number, returned as the appropriate type
       100
       -100
       +100
       3.14159
       6.02e23
       1e-12
       ''')
   pyparsing_common.fnumber.runTests('''
       # any int or real number, returned as float
       100
       -100
       +100
       3.14159
       6.02e23
       1e-12
       ''')
   pyparsing_common.hex_integer.runTests('''
       # hex numbers
       100
       FF
       ''')
   pyparsing_common.fraction.runTests('''
       # fractions
       1/2
       -3/4
       ''')
   pyparsing_common.mixed_integer.runTests('''
       # mixed fractions
       1
       1/2
       -3/4
       1-3/4
       ''')
   import uuid
   pyparsing_common.uuid.setParseAction(tokenMap(uuid.UUID))
   pyparsing_common.uuid.runTests('''
       # uuid
       12345678-1234-5678-1234-567812345678
       ''')
  prints:
   # any int or real number, returned as the appropriate type
   100
   [100]
   -100
   [-100]
   +100
   [100]
   3.14159
   [3.14159]
   6.02e23
   [6.02e+23]
   1e-12
   [1e-12]
   # any int or real number, returned as float
   100
   [100.0]
   -100
   [-100.0]
   +100
   [100.0]
   3.14159
   [3.14159]
   6.02e23
   [6.02e+23]
   1e-12
   [1e-12]
   # hex numbers
   100
   [256]
   FF
   [255]
   # fractions
   1/2
   [0.5]
   -3/4
   [-0.75]
   # mixed fractions
   1
   [1]
   1/2
   [0.5]
   -3/4
   [-0.75]
   1-3/4
   [1.75]
   # uuid
   12345678-1234-5678-1234-567812345678
   [UUID('12345678-1234-5678-1234-567812345678')]
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| Class Variables | |
| integer = integerexpression that parses an unsigned integer, returns an int | |
| hex_integer = hex integerexpression that parses a hexadecimal integer, returns an int | |
| signed_integer = signed integerexpression that parses an integer with optional leading sign, returns an int | |
| fraction = fractionfractional expression of an integer divided by an integer, returns a float | |
| mixed_integer = fraction or mixed integer-fractionmixed integer of the form 'integer - fraction', with optional leading integer, returns float | |
| real = real numberexpression that parses a floating point number and returns a float | |
| sci_real = real number with scientific notationexpression that parses a floating point number with optional scientific notation and returns a float | |
| number = {real number with scientific notation | real number |any numeric expression, returns the corresponding Python type | |
| fnumber = fnumberany int or real number, returned as float | |
| identifier = identifiertypical code identifier (leading alpha or '_', followed by 0 or more alphas, nums, or '_') | |
| ipv4_address = IPv4 addressIPv4 address ( 0.0.0.0 - 255.255.255.255) | |
| ipv6_address = IPv6 addressIPv6 address (long, short, or mixed form) | |
| mac_address = MAC addressMAC address xx:xx:xx:xx:xx (may also have '-' or '.' delimiters) | |
| iso8601_date = ISO8601 dateISO8601 date ( yyyy-mm-dd) | |
| iso8601_datetime = ISO8601 datetimeISO8601 datetime ( yyyy-mm-ddThh:mm:ss.s(Z|+-00:00)) - 
      trailing seconds, milliseconds, and timezone optional; accepts 
      separating'T'or' ' | |
| uuid = UUIDUUID ( xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx) | |
| comma_separated_list = comma separated listPredefined expression of 1 or more printable words or quoted strings, separated by commas. | |
| Method Details | 
| 
 Helper to create a parse action for converting parsed date string to Python datetime.date Params - 
 Example: 
   date_expr = pyparsing_common.iso8601_date.copy()
   date_expr.setParseAction(pyparsing_common.convertToDate())
   print(date_expr.parseString("1999-12-31"))
prints: [datetime.date(1999, 12, 31)] | 
| 
 Helper to create a parse action for converting parsed datetime string to Python datetime.datetime Params - 
 Example: 
   dt_expr = pyparsing_common.iso8601_datetime.copy()
   dt_expr.setParseAction(pyparsing_common.convertToDatetime())
   print(dt_expr.parseString("1999-12-31T23:59:59.999"))
prints: [datetime.datetime(1999, 12, 31, 23, 59, 59, 999000)] | 
| 
 Parse action to remove HTML tags from web page HTML source Example: 
   # strip HTML links from normal text 
   text = '<td>More info at the <a href="http://pyparsing.wikispaces.com">pyparsing</a> wiki page</td>'
   td,td_end = makeHTMLTags("TD")
   table_text = td + SkipTo(td_end).setParseAction(pyparsing_common.stripHTMLTags)("body") + td_end
   
   print(table_text.parseString(text).body) # -> 'More info at the pyparsing wiki page'
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| Class Variable Details | 
| numberany numeric expression, returns the corresponding Python type 
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