Regular Expressions 101

Pro

Group 1(\w+\s(?<!proposed\s))?

?repeats the group contents below at most once:

\w+any word character, repeated at least once

\sany whitespace character

Negative Lookbehind(?<!proposed\s)

proposedthe literal text proposed (case sensitive)

\sany whitespace character

topthe literal text top (case sensitive)

\sany whitespace character

ofthe literal text of (case sensitive)

\sany whitespace character

Group 2(existing\s)?

?repeats the group contents below at most once:

existingthe literal text existing (case sensitive)

\sany whitespace character

holethe literal text hole (case sensitive)

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

(\w+\s(?<!proposed\s))?top\sof\s(existing\s)?hole

proposed top of hole
top of hole
top of existing hole
existing top of hole

proposed top of hole
top of hole
top of existing hole
existing top of hole