Regular Expressions 101

^start of line

Character Class[46]

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

Non-Capturing Group(?:(?:\d{7})|(?:\d{6}[xX]))

1st Alternative(?:\d{7})

Non-Capturing Group(?:\d{7})

\d{7}a digit, repeated exactly 7 times

2nd Alternative(?:\d{6}[xX])

Non-Capturing Group(?:\d{6}[xX])

\d{6}a digit, repeated exactly 6 times

Character Class[xX]

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^[46](?:(?:\d{7})|(?:\d{6}[xX]))$

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