Regular Expressions 101

Group 1(["'])

Character Class["']

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Group 2((?:\\\1|(?:(?!\1)).)*)

Non-Capturing Group(?:\\\1|(?:(?!\1)).)*

*repeats the group contents below any number of times:

1st Alternative\\\1

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\1the text saved by group 1

2nd Alternative(?:(?!\1)).

Non-Capturing Group(?:(?!\1))

Negative Lookahead(?!\1)

\1the text saved by group 1

.any character (except for line terminators)

Group 3(\1)

\1the text saved by group 1

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

(["'])((?:\\\1|(?:(?!\1)).)*)(\1)

New

The sentence is 'He said "Hello there"'
The sentence is 'He said \'Goodbye\''
The sentence is 'Let\'s go!'

The sentence is "He said 'Hello there'"
The sentence is "He said \"Goodbye\""
The sentence is "Let's go!"

The sentence is "Double quote: \""
The sentence is "It's double quote: \""

Uncorrect line:
The sentence is 'Let's go!'