Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!0)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Non-Capturing Group(?:9\d\d|\d{4,5}|[1-7]\d{5}|8[0-5]\d{4}|86[0-3]\d{3}|864000)

1st Alternative9\d\d

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

\da digit

2nd Alternative\d{4,5}

\d{4,5}a digit, repeated between 4 and 5 times

3rd Alternative[1-7]\d{5}

Character Class[1-7]

1-7one character from 1 (49₁₀) to 7 (55₁₀)

\d{5}a digit, repeated exactly 5 times

4th Alternative8[0-5]\d{4}

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

\d{4}a digit, repeated exactly 4 times

5th Alternative86[0-3]\d{3}

86the literal text 86

Character Class[0-3]

0-3one character from 0 (48₁₀) to 3 (51₁₀)

\d{3}a digit, repeated exactly 3 times

6th Alternative864000

864000the literal text 864000

$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

^(?!0)(?:9\d\d|\d{4,5}|[1-7]\d{5}|8[0-5]\d{4}|86[0-3]\d{3}|864000)$

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