Regex Tester and generator

A Regex Tester and Regex Code Generator is a tool that helps users test regular expressions (regex) and generate the corresponding code to use those regex patterns in different programming languages.

Key Features of Regex Tester and Code Generator:
Regex Tester: Allows you to input a regex pattern and a test string to see how the regex matches (or doesn't match) the string. This helps in debugging or refining regular expressions.
Code Generator: Generates the code that you can use to apply the regex pattern in various programming languages such as Python, JavaScript, Java, PHP, etc.
Steps to Create a Regex Tester and Code Generator:
1. Regex Tester:
The tester will:

Allow the user to input a regex pattern.
Allow the user to input a test string.
Display the match results (e.g., the matched substrings, the number of matches, or whether the pattern was found in the string).
Here's a simple Python implementation using the re library to test a regex pattern:

python

import re

def test_regex(pattern, test_string):
# Compile the regex pattern
regex = re.compile(pattern)

# Find matches in the test string
matches = regex.findall(test_string)

# Return the matches or a message if no match is found
if matches:
return matches
else:
return "No matches found."

# Example usage
pattern = r"\d{3}-\d{2}-\d{4}" # Pattern to match Social Security Number (SSN)
test_string = "My SSN is 123-45-6789"
matches = test_regex(pattern, test_string)
print("Matches:", matches)
Example Output:
sql

Matches: ['123-45-6789']
2. Regex Code Generator:
The code generator will take a regex pattern and automatically generate code for different programming languages. Below is an example of how the code generation might look for Python, JavaScript, and PHP.

Regex Pattern: r"\d{3}-\d{2}-\d{4}" (to match a Social Security Number)

Python:
python

import re

pattern = r"\d{3}-\d{2}-\d{4}"
test_string = "My SSN is 123-45-6789"
matches = re.findall(pattern, test_string)

print(matches)
JavaScript:
javascript

const pattern = /\d{3}-\d{2}-\d{4}/;
const testString = "My SSN is 123-45-6789";
const matches = testString.match(pattern);

console.log(matches);
PHP:
php

<?php
$pattern = '/\d{3}-\d{2}-\d{4}/';
$testString = "My SSN is 123-45-6789";
preg_match($pattern, $testString, $matches);

print_r($matches);
?>
Implementing a Simple Regex Tester and Code Generator in Python:
python

import re

def test_regex(pattern, test_string):
"""Test if the regex pattern matches the test string."""
regex = re.compile(pattern)
matches = regex.findall(test_string)

if matches:
return matches
else:
return "No matches found."

def generate_code(pattern, language="Python"):
"""Generate code based on the selected language."""
if language == "Python":
return f"""
import re

pattern = r"{pattern}"
test_string = "Your test string here"
matches = re.findall(pattern, test_string)

print(matches)
"""
elif language == "JavaScript":
return f"""
const pattern = /{pattern}/;
const testString = "Your test string here";
const matches = testString.match(pattern);

console.log(matches);
"""
elif language == "PHP":
return f"""
<?php
$pattern = '/{pattern}/';
$testString = "Your test string here";
preg_match($pattern, $testString, $matches);

print_r($matches);
?>
"""
else:
return "Language not supported."

# Example usage
pattern = r"\d{3}-\d{2}-\d{4}"
test_string = "My SSN is 123-45-6789"
print("Matches:", test_regex(pattern, test_string))

# Generate code for different languages
print("Python Code:\n", generate_code(pattern, "Python"))
print("JavaScript Code:\n", generate_code(pattern, "JavaScript"))
print("PHP Code:\n", generate_code(pattern, "PHP"))
Example Output:
php

Matches: ['123-45-6789']
Python Code:

import re

pattern = r"\d{3}-\d{2}-\d{4}"
test_string = "Your test string here"
matches = re.findall(pattern, test_string)

print(matches)

JavaScript Code:

const pattern = /\d{3}-\d{2}-\d{4}/;
const testString = "Your test string here";
const matches = testString.match(pattern);

console.log(matches);

PHP Code:

<?php
$pattern = '/\d{3}-\d{2}-\d{4}/';
$testString = "Your test string here";
preg_match($pattern, $testString, $matches);

print_r($matches);
?>
Use Cases for Regex Tester and Code Generator:
Learning & Education: Helps students and beginners understand how regular expressions work and how they are used in different programming languages.
Development: Useful for developers who frequently work with regex patterns and need to test them or convert them into code for different programming languages.
Debugging: If you're facing issues with regular expressions, a tester can help quickly verify and adjust your regex.
Cross-Language Conversion: Quickly convert a regex pattern from one language to another (e.g., Python to JavaScript).