Regular Expressions 101

Group 1(^|[^"])

1st Alternative^

^start of string

2nd Alternative[^"]

Negated Character Class[^"]

"the literal " (34₁₀ / 42₈ / 22₁₆)

Group 2(Level\s+\d+)

Levelthe literal text Level (case sensitive)

\s+any whitespace character, repeated at least once

\d+a digit, repeated at least once

Negative Lookahead(?!["\d])

Character Class["\d]

"the literal " (34₁₀ / 42₈ / 22₁₆)

\da digit

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(^|[^"])(Level\s+\d+)(?!["\d])

New

"Level 3 protected": Level 4 here and "another Level 5"

$1"$2"