pyparsing-users

[Pyparsing] Pyparsing equivalent to regex \1, \2 ... patterns

[Loïc B. <lo...@li...>]

Hi,

I would like to define a parser to detect strings containing repeated terms :

  - it should match 'A123A', 'B123B'
  - but not 'A123B'

With python re module, I would define a parser like this :

   parser = re.compile(r'(\w+)(\d+)\1')
  
Is there a pyparsing equivalent to re \1 and \2 patterns in pyparsing ?

-- 
Loïc

Re: [Pyparsing] Pyparsing equivalent to regex \1, \2 ... patterns

[Paul M. <pt...@au...>]

Check out matchPreviousExpr and matchPreviousLiteral methods.

-- Paul

-----Original Message-----
From: Loïc Berthe [mailto:lo...@li...] 
Sent: Thursday, January 30, 2014 3:56 PM
To: pyp...@li...
Subject: [Pyparsing] Pyparsing equivalent to regex \1, \2 ... patterns

Hi,

I would like to define a parser to detect strings containing repeated terms
:

  - it should match 'A123A', 'B123B'
  - but not 'A123B'

With python re module, I would define a parser like this :

   parser = re.compile(r'(\w+)(\d+)\1')
  
Is there a pyparsing equivalent to re \1 and \2 patterns in pyparsing ?

--
Loïc

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