Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=0+[1-9])

0+the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated at least once

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

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

$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+[1-9])0\d{5}$

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