Regular Expressions 101

Explanation

Pro

1st Alternative^[1-9]{1}$

^start of line

Character Class[1-9]{1}

{1}matches one character from the set below:

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

$end of line

2nd Alternative^[1-3]{1}[0-9]{1}$

^start of line

Character Class[1-3]{1}

{1}matches 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)

$end of line

3rd Alternative^4{1}[0-5]{1}$

^start of line

4{1}the literal 4 (52₁₀ / 64₈ / 34₁₆) , repeated exactly 1 time

Character Class[0-5]{1}

{1}matches one character from the set below:

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

$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

^[1-9]{1}$|^[1-3]{1}[0-9]{1}$|^4{1}[0-5]{1}$

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