Regular Expressions 101

Group 1((?<!(?<!\\)\\)["'])

Negative Lookbehind(?<!(?<!\\)\\)

Negative Lookbehind(?<!\\)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Character Class["']

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

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

*?repeats the group contents below any number of times:

Positive Lookahead(?=(\\?))

Group 2(\\?)

\\?optionally matches the literal \ (92₁₀ / 134₈ / 5C₁₆)

\2the text saved by group 2

.any character (except for line terminators)

Negative Lookbehind(?<!(?<!\\)\\)

Negative Lookbehind(?<!\\)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\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

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

New

<p>
  <span style="color: #ff0000">"str1"</span> notstr
  <span style="color: #ff0000">"str2"</span>
  \"notstr <span style="color: \"aa #ff0000">"str4"</span>
  \\"hello"
</p>

Regular Expression

Extraction