Regular expression pattern for the #include directive

I'm currently developing a node.js JSON tool that involves incorporating external JSON files and merging them after performing nested lookups. I've hit a roadblock with regex patterns needed to validate the following scenarios:

!include('other.json') - true
!include("../folder/1.json") - true
!include(./current/external.json) - true
#include('other.json') - false

It's important for the starting and ending quotations to match:

!include('file.json) - false
!include('file.json") - false

Regex isn't my strong suit, so any guidance would be greatly appreciated.

javascriptjsonregex

Answer №1

Check out this solution with detailed comments:

/^!include\((['"]?)[^'")]+'\)/
  • ^ - indicates the start of a string
  • !include\( - matches the exact string !include( (parentheses need to be escaped in regex)
  • (['"]?) - creates a group to match either a single quote or double quote, making it optional with ?
  • [^'")]+ - matches any character except for single quotes, double quotes, and closing parentheses
  • \1 - references what was matched in group one to avoid mismatched quotations
  • \) - matches the final closing parentheses

If you're looking to learn more about regex, I recommend watching Lea Verou's insightful talk Reg(exp){2}lained/: Demystifying Regular Expressions. For testing and practicing regex, check out , which offers a helpful cheatsheet as well.

For experimenting with different scenarios, feel free to visit .

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