Regular Expressions 101

1st Alternative^(F+)[.]?$

^start of line

Group 1(F+)

F+the literal F (70₁₀ / 106₈ / 46₁₆) (case sensitive), repeated at least once

Character Class[.]?

?matches at most one character from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

$end of line

2nd Alternative[.](F+)

Character Class[.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(F+)

F+the literal F (70₁₀ / 106₈ / 46₁₆) (case sensitive), repeated at least once

3rd Alternative(F+)[.]

Group 3(F+)

F+the literal F (70₁₀ / 106₈ / 46₁₆) (case sensitive), repeated at least once

Character Class[.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

^(F+)[.]?$|[.](F+)|(F+)[.]

New

F
.F
F.
..
.F.
FF
.FF
FF.
FFF
.FFF
FFF.
.FFF.
..FFFF..
FAIL
Fail
AFTER
FLUFF