Regular Expressions 101

^start of line

0*the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated any number of times

Non-Capturing Group(?:[1-9][0-9]{2,}|[2-9][0-9]|1[5-9])

1st Alternative[1-9][0-9]{2,}

Character Class[1-9]

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

Character Class[0-9]{2,}

{2,}matches at least 2 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

2nd Alternative[2-9][0-9]

Character Class[2-9]

2-9one character from 2 (50₁₀) to 9 (57₁₀)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

3rd Alternative1[5-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[5-9]

5-9one character from 5 (53₁₀) to 9 (57₁₀)

$end of line

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^0*(?:[1-9][0-9]{2,}|[2-9][0-9]|1[5-9])$

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//Reference: https://stackoverflow.com/questions/52700629/to-match-any-number-greater-than-15-using-regexp