Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #101101

Re: Newbie: Check first two non-whitespace characters

Show key headers only | View raw

On 01/01/2016 00:25, Mark Lawrence wrote:
> On 31/12/2015 18:54, Karim wrote:
>>
>>
>> On 31/12/2015 19:18, otaksoftspamtrap@gmail.com wrote:
>>> I need to check a string over which I have no control for the first 2
>>> non-white space characters (which should be '[{').
>>>
>>> The string would ideally be: '[{...' but could also be something like
>>> '  [  {  ....'.
>>>
>>> Best to use re and how? Something else?
>>
>> Use pyparsing it is straight forward:
>>
>>  >>> from pyparsing import Suppress, restOfLine
>>
>>  >>> mystring = Suppress('[') + Suppress('{') + restOfLine
>>
>>  >>> result = mystring.parse(' [ { .... I am learning pyparsing' )
>>
>>  >>> print result.asList()
>>
>> ['.... I am learning pyparsing']
>>
>> You'll get your string inside the list.
>>
>> Hope this help see pyparsing doc for in depth study.
>>
>> Karim
>
> Congratulations for writing up one of the most overengineered pile of 
> cobblers I've ever seen.
>

You welcome !

The intent was to make a simple introduction to pyparsing which is a 
powerful tool for more complex parser build.

Karim

Back to comp.lang.python | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Newbie: Check first two non-whitespace characters otaksoftspamtrap@gmail.com - 2015-12-31 10:18 -0800
  Re: Newbie: Check first two non-whitespace characters MRAB <python@mrabarnett.plus.com> - 2015-12-31 18:38 +0000
  Re: Newbie: Check first two non-whitespace characters Karim <kliateni@gmail.com> - 2015-12-31 19:54 +0100
  Re: Newbie: Check first two non-whitespace characters Karim <kliateni@gmail.com> - 2015-12-31 20:05 +0100
    Re: Newbie: Check first two non-whitespace characters cassius.fechter@gmail.com - 2015-12-31 11:21 -0800
  Re: Newbie: Check first two non-whitespace characters Cory Madden <csmadden@gmail.com> - 2015-12-31 10:56 -0800
  Re: Newbie: Check first two non-whitespace characters Denis McMahon <denismfmcmahon@gmail.com> - 2015-12-31 20:35 +0000
  Re: Newbie: Check first two non-whitespace characters Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-12-31 23:25 +0000
    Re: Newbie: Check first two non-whitespace characters Steven D'Aprano <steve@pearwood.info> - 2016-01-01 12:12 +1100
  Re: Newbie: Check first two non-whitespace characters Steven D'Aprano <steve@pearwood.info> - 2016-01-01 12:23 +1100
  Re: Newbie: Check first two non-whitespace characters Random832 <random832@fastmail.com> - 2015-12-31 20:31 -0500
  Re: Newbie: Check first two non-whitespace characters Jussi Piitulainen <harvesting@is.invalid> - 2016-01-01 10:16 +0200
  Re: Newbie: Check first two non-whitespace characters Karim <kliateni@gmail.com> - 2016-01-01 10:43 +0100

csiph-web