Regular Expressions 101

Non-Capturing Group(?:(\+\d\d\s+)?((?:$\d\d$|\d\d)\s+)?)

Group 1(\+\d\d\s+)?

?repeats the group contents below at most once:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\da digit

\s+any whitespace character, repeated at least once

Group 2((?:$\d\d$|\d\d)\s+)?

?repeats the group contents below at most once:

Non-Capturing Group(?:$\d\d$|\d\d)

1st Alternative$\d\d$

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\da digit

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

2nd Alternative\d\d

\da digit

\s+any whitespace character, repeated at least once

Group 3(\d{4,5}\-?\d{4})

\d{4,5}a digit, repeated between 4 and 5 times

\-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{4}a digit, repeated exactly 4 times

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

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Search reference

Regular Expression

(?:(\+\d\d\s+)?((?:\(\d\d\)|\d\d)\s+)?)(\d{4,5}\-?\d{4})

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