Regular Expressions 101

Positive Lookbehind(?<=\s)

\sany whitespace character

Group 1(\d+)

\d+a digit, repeated at least once

Positive Lookahead(?=\s)

\sany whitespace character

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)(\d+)(?=\s)

999993111 Example text start 999993112 999993113 999993114 Example text end 999993115