Format Shift

A separator or delimiter is moved to an incorrect position.

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A separator or delimiter is moved to an incorrect position.

Format shift errors occur when a separator character (like a hyphen or dash) is placed in the wrong position within a formatted code. This changes the visual grouping of the data without changing the actual characters. It's common when manually entering codes that follow specific format patterns.

Separator moves from position M to position N: AB-1234 → A-B1234

AB-1234 → A-B1234 (hyphen shifted left)
AB-1234 → ABC-234 (hyphen shifted right)
12-34-56 → 123-4-56 (hyphen repositioned)

How to recognize it

Separator in unexpected position
Same characters but different grouping
Total length remains the same

Common mistakes

Assuming format is always correct
Not checking separator positions
Focusing only on alphanumeric characters

Step-by-step walkthrough

Find the error: Original 'AB-1234' vs Given 'A-B1234'

Compare position 1: 'A' = 'A'
Compare position 2: 'B' vs '-' - mismatch
Compare position 3: '-' vs 'B' - mismatch
The hyphen moved from position 3 to position 2
All characters are present but separator is misplaced
Original format: 'AB-1234' (2 letters, hyphen, 4 digits)
Error format: 'A-B1234' (1 letter, hyphen, 1 letter, 4 digits)

Answer: Format shift error: hyphen moved from position 3 to position 2

Practice guidance

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