Regular Expressions 101

$end of line

Negative Lookbehind(?<!_1[6-9]|_2[0-4])

1st Alternative_1[6-9]

_1the literal text _1

Character Class[6-9]

6-9one character from 6 (54₁₀) to 9 (57₁₀)

2nd Alternative_2[0-4]

_2the literal text _2

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

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

$(?<!_1[6-9]|_2[0-4])

New

x2016_17_7
x2017_188
x2018_199
x2019_20_10
x2020_21_11
x2021_22_12
x2022_23_13
x2023_20_10
x202025_15
x2016_17_16
x2017_18_17
x2018_19_18
x2019_20_19
x2020_21_20
x2021_22_21
x2022_23_22
x2023_20_23
x2020_25_20

Regular Expression

Extraction