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(?=.*\+[0-9]{3}\s?[0-9]{2}\s?[0-9]{3}\s?[0-9]{4,5}$)

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gm

Positive Lookahead

(?=.*\+[0-9]{3}\s?[0-9]{2}\s?[0-9]{3}\s?[0-9]{4,5}$)

Assert that the Regex below matches

.

matches any character (except for line terminators)* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

\+ matches the character + with index 43_{10} (2B_{16} or 53_{8}) literally (case sensitive)

Match a single character present in the list below

[0-9]

{3} matches the previous token exactly 3 times

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

Match a single character present in the list below

[0-9]

{2} matches the previous token exactly 2 times

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

Match a single character present in the list below

[0-9]

{3} matches the previous token exactly 3 times

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

\s

matches any whitespace character (equivalent to [\r\n\t\f\v ])? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

Match a single character present in the list below

[0-9]

{4,5} matches the previous token between 4 and 5 times, as many times as possible, giving back as needed (greedy)

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

$ asserts position at the end of a line

Global pattern flags

g modifier: **g**lobal. All matches (don't return after first match)

m modifier: **m**ulti line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)

Your regular expression does not match the subject string.Try launching the debugger to find out why.

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gm

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