Regular Expressions 101

1st Alternative(?<!\S)((?:\+1)?)(\d{3})(\d{5})(?!\S)

Negative Lookbehind(?<!\S)

\Sany character that is not Unicode whitespace

Group 1((?:\+1)?)

Non-Capturing Group(?:\+1)?

?repeats the group contents below at most once:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Group 2(\d{3})

\d{3}a Unicode decimal digit, repeated exactly 3 times

Group 3(\d{5})

\d{5}a Unicode decimal digit, repeated exactly 5 times

Negative Lookahead(?!\S)

\Sany character that is not Unicode whitespace

2nd Alternative\d+

\d+a Unicode decimal digit, repeated at least once

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<!\S)((?:\+1)?)(\d{3})(\d{5})(?!\S)|\d+

New

Mr.X has 23 apples and 59 oranges, his business partner from Colorado staying staying in hotel with phone number +188991234 and his wife and kids are staying away from him

This is a tel 12345678 and this is 1234567 123456789