Regular Expressions 101

Pro

1st Alternative((['"])(?:\\.|(?!\2).)*(?<!\\)\2)

Group 1((['"])(?:\\.|(?!\2).)*(?<!\\)\2)

Group 2(['"])

Character Class['"]

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

Non-Capturing Group(?:\\.|(?!\2).)*

*repeats the group contents below any number of times:

1st Alternative\\.

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

.any character (except for line terminators)

2nd Alternative(?!\2).

Negative Lookahead(?!\2)

\2the text saved by group 2

.any character (except for line terminators)

Negative Lookbehind(?<!\\)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\2the text saved by group 2

2nd Alternative\bFOO\b

\ban ASCII word boundary

FOOthe literal text FOO (case sensitive)

\ban ASCII word boundary

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.

26 tokens

Regular Expression

((['"])(?:\\.|(?!\2).)*(?<!\\)\2)|\bFOO\b

New

    name: FOO
    favoriteQuote: "I am my own FOO."
    children: 'FOO\'s children'
    cars: ownersList[FOO]
    statement = FOO + " is the owner of the house."

    FOO "FOO" 'FOO' "    1 + FOO + 2 " ABCFOOXYZ "  str1\"FOO\"str3'FOO'\'\'" '  str1\'FOOstr3"FOO"\"\"' \"FOO\"