Extracting Port Quantity from a localhost API Request to a Server utilizing Common Expressions

Given a String test_str as localhost API Request Handle, the duty is to get the extract port variety of the service.

Examples:

Enter: test_str = ‘http://localhost:8109/customers/addUsers’
Output: 8109
Rationalization: Port Quantity, 8109 extracted.

Enter: test_str = ‘http://localhost:1337/api/merchandise’
Output: 1337
Rationalization: Port Quantity, 1337 extracted.

Strategy: The issue may be solved primarily based on the next concept:

Create a regex sample to validate the quantity as written beneath:   
regex = “[:]{1}[0-9]{4, }“

The place,  

• [:]: This sample will match if one of many previous is a colon character
• [0-9]{4} : This sample will enable 4 or greater than 4 previous components if they’re digits.

Observe the beneath steps to implement the thought:

• Create a regex expression to extract all of the Port numbers from the string.
• Use Sample class to compile the regex fashioned.
• Use the matcher perform to search out.

Beneath is the code implementation of the above-discussed method:

Given String is:
http://localhost:8082/api/safe
Above Given API is operating on Port Quantity:
8082

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