Regular Expressions 101

Explanation

Pro

^start of line

Group 1([1-3]?[0-9]{1}[0]{2}|4[0-3]{1}[0]{2})

1st Alternative[1-3]?[0-9]{1}[0]{2}

Character Class[1-3]?

?matches at most one character from the set below:

1-3one character from 1 (49₁₀) to 3 (51₁₀)

Character Class[0-9]{1}

{1}matches one character from the set below:

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

Character Class[0]{2}

{2}matches exactly 2 characters from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative4[0-3]{1}[0]{2}

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

Character Class[0-3]{1}

{1}matches one character from the set below:

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

Character Class[0]{2}

{2}matches exactly 2 characters from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

$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

^([1-3]?[0-9]{1}[0]{2}|4[0-3]{1}[0]{2})$

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