Regular Expressions 101

Pro

^start of line

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

Non-Capturing Group(?:_[^_r\n]*?(\d+)M)?

?repeats the group contents below at most once:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Negated Character Class[^_r\n]*?

*?matches any number of characters outside the set below:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

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

Group 1(\d+)

\d+a digit, repeated at least once

Mthe literal M (77₁₀ / 115₈ / 4D₁₆) (case sensitive)

$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

^.*?(?:_[^_r\n]*?(\d+)M)?$

New

A1M_PRE
AC2_0M
GA3_30M
DE3_1H30M

$1

A1M_PRE
AC2_0M
GA3_30M
DE3_1H30M