regex101: PCRE (Legacy) Match Workspace

Pro

^start of line

Positive Lookahead(?=(?:[^\d\n]*\d){1,15}[])]?$)

Non-Capturing Group(?:[^\d\n]*\d){1,15}

{1,15}repeats the group contents below between 1 and 15 times:

Negated Character Class[^\d\n]*

*matches any number of characters outside the set below:

\da digit

\na line-feed (newline) character (ASCII 10)

\da digit

Character Class[])]?

?matches at most one character from the set below:

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

$end of line

Non-Capturing Group(?:[+]?\d++|[(][+]?\d++[)]|[[][+]?\d++[]])

1st Alternative[+]?\d++

Character Class[+]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\d++a digit, repeated at least once

2nd Alternative[(][+]?\d++[)]

Character Class[(]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

Character Class[+]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\d++a digit, repeated at least once

Character Class[)]

)the literal ) (41₁₀ / 51₈ / 29₁₆)

3rd Alternative[[][+]?\d++[]]

Character Class[[]

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Character Class[+]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\d++a digit, repeated at least once

Character Class[]]

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

*+repeats the group contents below any number of times:

Character Class[ .-]?+

?+matches at most one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:\d\d++|[(]\d\d++[)]|[[]\d\d++[]])

1st Alternative\d\d++

\da digit

\d++a digit, repeated at least once

2nd Alternative[(]\d\d++[)]

Character Class[(]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

\da digit

\d++a digit, repeated at least once

Character Class[)]

)the literal ) (41₁₀ / 51₈ / 29₁₆)

3rd Alternative[[]\d\d++[]]

Character Class[[]

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\da digit

\d++a digit, repeated at least once

Character Class[]]

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

$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

25 tokens

Regular Expression

^(?=(?:[^\d\n]*\d){1,15}[])]?$)(?:[+]?\d++|[(][+]?\d++[)]|[[][+]?\d++[]])(?:[ .-]?+(?:\d\d++|[(]\d\d++[)]|[[]\d\d++[]]))*+$

Unit Tests

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