Regular Expressions 101

Explanation
Pro

message: the literal text message: (case sensitive)

Group 1(['"])?

?repeats the group contents below at most once:

Character Class['"]

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

ONthe literal text ON (case sensitive)

Condition(?(1)\1)

Uses the first branch if group 1 matched

If the condition is true, match this branch:\1

\1the text saved by group 1

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

message: (['"])?ON(?(1)\1)

New

message: ON
message: "ON"
message: 'ON'
message: "TONC"
message: Los Angeles, ON
message: HOLDS ON FILE