Regular Expressions 101

^start of line

Group 1(.+?)

.+?any character (except for line terminators), repeated at least once

Positive Lookahead(?=\sAA BB)

\sany whitespace character

AA BBthe literal text AA BB (case sensitive)

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

$end of line

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

^(.+?)(?=\sAA BB).*$

01 02 03 AA BB CC FF
01 02 03 01 02 03 01 02 AF AA BB CC FF
01 02 03 01 02 AA BB 01 02 AF AA BB CC FF