Regular Expressions 101

Explanation
Pro

^start of line

Group 1(($\+{0,2}[0-9]{1,2}$|\+{0,2}[0-9]{0,2})?([0-9 ]+)?)

Group 2($\+{0,2}[0-9]{1,2}$|\+{0,2}[0-9]{0,2})?

?repeats the group contents below at most once:

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

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\+{0,2}the literal + (43₁₀ / 53₈ / 2B₁₆) , repeated between 0 and 2 times

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

2nd Alternative\+{0,2}[0-9]{0,2}

\+{0,2}the literal + (43₁₀ / 53₈ / 2B₁₆) , repeated between 0 and 2 times

Character Class[0-9]{0,2}

{0,2}matches between 0 and 2 characters from the set below:

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

Group 3([0-9 ]+)?

?repeats the group contents below at most once:

Character Class[0-9 ]+

+matches at least one character from the set below:

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

the literal (32₁₀ / 40₈ / 20₁₆)

$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

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25 tokens

^((\(\+{0,2}[0-9]{1,2}\)|\+{0,2}[0-9]{0,2})?([0-9 ]+)?)$

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