A tool to translate regular expressions to smt-lib constraints

1. Get the code in your machine, either by downloading the zip or using git clone. Make sure to run the following command to get the ply submodule (which is used by the tool):

   git submodule update --init
   

2. Just download the code and use the tool as follows:

   Command:

   PYTHONPATH=/Users/sgomber/Desktop/Temp/regex-to-smtlib python3 src/convert.py '2(3|1*)'
   

   In action:

   Desktop/Temp/regex-to-smtlib >> PYTHONPATH=/Users/sgomber/Desktop/Temp/regex-to-smtlib python3 src/convert.py '2(3|1*)'            
   (re.++ (str.to_re "2") (re.union (str.to_re "3") (re.* (str.to_re "1"))))
   

   In PYTHONPATH, provide the path to the project (both absolute or relative work). The PYTHONPATH can also be set as a variable in the environment.

3. Checkout the tests in test-converter.py to see the present state of supported syntax.

   The tests can be run using the following command:

   PYTHONPATH=/Users/sgomber/Desktop/Temp/regex-to-smtlib python3 tests/test-converter.py
   

• Optimize the generated regex for char sequences ( (re.++ (str.to_re "a") (str.to_re "b")) -> (str.to_re "ab"))
• Support for . (allchar)
• See how space (' ') should be handled within regex (is ignored presently, not ideal)
• Support for re.all and re.none (Will have to think of regex symbols for these)
• Character Sets
• Anchoring (^$) (not sure if smtlib supports this)
• Escaped Characters
• ? syntax
• {m, n} syntax