Regular Expressions 101

Pro

^start of line

\+?optionally matches the literal + (43₁₀ / 53₈ / 2B₁₆)

\d*a digit, repeated any number of times

\s?optionally matches any whitespace character

Non-Capturing Group(?:$\d+$\s?\d+([-\s.]?)(?:\1?\d)*|([.\s-]?)(?:\2?\d)*)

1st Alternative$\d+$\s?\d+([-\s.]?)(?:\1?\d)*

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\d+a digit, repeated at least once

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\s?optionally matches any whitespace character

\d+a digit, repeated at least once

Group 1([-\s.]?)

Character Class[-\s.]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\sany whitespace character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:\1?\d)*

*repeats the group contents below any number of times:

\1?optionally matches the text saved by group 1

\da digit

2nd Alternative([.\s-]?)(?:\2?\d)*

Group 2([.\s-]?)

Character Class[.\s-]?

?matches at most one character from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\sany whitespace character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:\2?\d)*

*repeats the group contents below any number of times:

\2?optionally matches the text saved by group 2

\da digit

$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

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26 tokens

^\+?\d*\s?(?:\(\d+\)\s?\d+([-\s.]?)(?:\1?\d)*|([.\s-]?)(?:\2?\d)*)$

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