Regular Expressions 101

Non-Capturing Group(?:^(?=[^.]+(?:\.[^.]+)+$)|\G(?!^))

1st Alternative^(?=[^.]+(?:\.[^.]+)+$)

^start of line

Positive Lookahead(?=[^.]+(?:\.[^.]+)+$)

Negated Character Class[^.]+

+matches at least one character outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

+repeats the group contents below at least once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^.]+

+matches at least one character outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

$end of line

2nd Alternative\G(?!^)

\Gstart of current search

Negative Lookahead(?!^)

^start of line

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 1([^\][.]+)

Negated Character Class[^\][.]+

+matches at least one character outside the set below:

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

?repeats the group contents below at most once:

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group 2(\d+)

\d+a digit, repeated at least once

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

Regular Expression

(?:^(?=[^.]+(?:\.[^.]+)+$)|\G(?!^))\.?([^\][.]+)(?:\[(\d+)\])?

New

b.c[2].d[123].e1[4].f88[5]

b.c[2].d[123].e1[4].f88[5]