Regular Expressions 101

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

[0-9]

New

1 start with number
end with number 2
number 3 in the middle
basically anywhere.

So these lines are also not single matches:
1234
123456