Engineering Question I am looking out for good Parser libraries Basically want to parse email bodies & extract specific key values from it for eg: consider email body like

First Name: {{first_name}} 
Last Name: {{last_name}}

The parser should be able to extract those values first_name: abc

Why not build one using regex and Python?

That will be my last solution Checking to see if there are any lib that makes it easier instead of me writing regex avoiding that

if the structure is guaranteed to be like that, yaml parser would work

what language are you using? There are a couple of different approaches possible: 1. Use a parser-generator. This is the most flexible way, but requires a lot of wrangling. 2. You can write a custom parser if your input data has a uniform structure, like key value pairs separated by a delimiter.

Using python And yeah it's expected in a structure

Just use simple string manipulation then

Writing a parser is perhaps the best idea. It can be modified as you want according to the structure rather than depending on a library.

Got it, Seems like using regex is inevitable at some stage

Since, you have mentioned the language Python, I would recommend you to take a look at django’s template parsing: https://docs.djangoproject.com/en/3.2/_modules/django/template/base/

You can use pyparsing to create custom parsers with ease. https://pypi.org/project/pyparsing/

Thank you everyone for your response It helped