Regular Expressions 101

Explanation

Pro

Positive Lookbehind(?<=\d)

\da Unicode decimal digit

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Positive Lookahead(?=\d+$)

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

$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.

25 tokens

(?<=\d)_(?=\d+$)

New

NW_011625257.1_0
NW_011623521.1_1
NW_011623521.3_1
NW_011623521.4_1
NW_011623521.1
JZSA01007324.1_2
scaffold_1463_2
scaffold_1463

NW_011625257.1_0
NW_011623521.1_1
NW_011623521.3_1
NW_011623521.4_1
NW_011623521.1
JZSA01007324.1_2
scaffold_1463_2
scaffold_1463