Regular Expressions 101

\ban ASCII word boundary

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

Positive Lookahead(?=$|\n.*$)

1st Alternative$

$end of string, or before its final line terminator

2nd Alternative\n.*$

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

.*any character (except for line terminators), repeated any number of times

$end 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

\b\d{5}(?=$|\n.*$)

New

Bob Smith
123 Maple St Apt 44456
44325 Blue Building
Newington, CT. 06000
12345 06111