Regular Expressions 101

Pro

Positive Lookbehind(?<=(\w+(?:\[\d+])+))

Group 1(\w+(?:\[\d+])+)

\w+any word character, repeated at least once

Non-Capturing Group(?:\[\d+])+

+repeats the group contents below at least once:

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\d+a digit, repeated at least once

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Positive Lookahead(?=\[|$)

1st Alternative\[

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

2nd Alternative$

$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.

26 tokens

(?<=(\w+(?:\[\d+])+))(?=\[|$)

New

hello
hello[0]
hello[0][1]
hello[0][1][3]
hello[0][1][3][2]

hello
hello[0]
hello[0][1]
hello[0][1][3]
hello[0][1][3][2]