Regular Expressions 101

1st Alternative^ ?[8\+] ?7?([ \-$]{1,3})?([0-9]{3}([ $\-]{1,4})?)

^start of line

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[8\+]

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

7?optionally matches the literal 7 (55₁₀ / 67₈ / 37₁₆)

Group 1([ \-\(]{1,3})?

?repeats the group contents below at most once:

Character Class[ \-\(]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

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

Character Class[0-9]{3}

{3}matches exactly 3 characters from the set below:

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

Group 3([ \)\-]{1,4})?

?repeats the group contents below at most once:

Character Class[ \)\-]{1,4}

{1,4}matches between 1 and 4 characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative([0-9]{4}([ \)\-]{1,2})?)$

Group 4([0-9]{4}([ \)\-]{1,2})?)

Character Class[0-9]{4}

{4}matches exactly 4 characters from the set below:

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

Group 5([ \)\-]{1,2})?

?repeats the group contents below at most once:

Character Class[ \)\-]{1,2}

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

the literal (32₁₀ / 40₈ / 20₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

$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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Search reference

Regular Expression

^ ?[8\+] ?7?([ \-\(]{1,3})?([0-9]{3}([ \)\-]{1,4})?)|([0-9]{4}([ \)\-]{1,2})?)$

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