Regular Expressions 101

Positive Lookbehind(?<=\;|\A)

1st Alternative\;

\;the literal ; (59₁₀ / 73₈ / 3B₁₆)

2nd Alternative\A

\Astart of string

Character Class[\+\-\_]?

?matches at most one character from the set below:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\d{7,}a digit, repeated at least 7 times

Positive Lookahead(?=\;|\Z)

1st Alternative\;

\;the literal ; (59₁₀ / 73₈ / 3B₁₆)

2nd Alternative\Z

\Zend of string, or before its final line terminator

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<=\;|\A)[\+\-\_]?\d{7,}(?=\;|\Z)

New

1234567777;-1234567777;_1234567777;+1234567891;@2312348;+_-+012383234