Regular Expressions 101

Explanation

Pro

Comment: the opening delimiter

Group 1(["'])

Character Class["']

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Comment: the body is

Non-Capturing Group(?: # either an escaped delimiter \\\1 # or | # anything except a backslash or a delimiter (?!\\|\1). # (can't put \1 in a character class, so use a negative lookahead) )*

*repeats the group contents below any number of times:

1st Alternative # either an escaped delimiter \\\1 # or

Comment: either an escaped delimiter

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\1the text saved by group 1

Comment: or

2nd Alternative # anything except a backslash or a delimiter (?!\\|\1). # (can't put \1 in a character class, so use a negative lookahead)

Comment: anything except a backslash or a delimiter

Negative Lookahead(?!\\|\1)

1st Alternative\\

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

2nd Alternative\1

\1the text saved by group 1

.any character (except for line terminators)

Comment: (can't put \1 in a character class, so use a negative lookahead)

Comment: repeated zero or more times# the closing delimiter

\1the text saved by group 1

Global pattern flags

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

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

Unit Test Summary

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Quick Reference

25 tokens

Regular Expression

# the opening delimiter
(["'])
# the body is
(?:
  # either an escaped delimiter
  \\\1
  # or
  |
  # anything except a backslash or a delimiter
  (?!\\|\1).
  # (can't put \1 in a character class, so use a negative lookahead)
)*
# repeated zero or more times# the closing delimiter
\1

Unit Tests

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