Which regular expression matches loopback IP address (127.0.0.1)?

The correct answer is C. 127\.0\.0\.1. Regular expressions (regex) use special characters that need to be escaped with a backslash (\) to be interpreted literally. In this case, the dot (.) is a metacharacter in regex that matches any character. To specifically match the dots in the loopback IP (127.0.0.1), they…

Submitted by noor.lb· Mar 6, 2026Security Concepts

Question

Options

A&127%0%0%1
B%127.0.0.1%
C127.0.0.1
D127[.0.].0.\

How the community answered

(32 responses)

A
3% (1)
B
6% (2)
C
91% (29)

Explanation

Regular expressions (regex) use special characters that need to be escaped with a backslash () to be interpreted literally. In this case, the dot (.) is a metacharacter in regex that matches any character. To specifically match the dots in the loopback IP (127.0.0.1), they must be escaped

Topics

#regular expressions#regex#IP addressing

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