Regular Expressions 101

Explanation
Pro

1st Alternative\s*"\s*([^ "]+)"\s*(?=[">])

\s*any whitespace character, repeated any number of times

"the literal " (34₁₀ / 42₈ / 22₁₆)

\s*any whitespace character, repeated any number of times

Group 1([^ "]+)

Negated Character Class[^ "]+

+matches at least one character outside the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

\s*any whitespace character, repeated any number of times

Positive Lookahead(?=[">])

Character Class[">]

"the literal " (34₁₀ / 42₈ / 22₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

2nd Alternative(?<=")("")(?=")

Positive Lookbehind(?<=")

"the literal " (34₁₀ / 42₈ / 22₁₆)

Group 2("")

""the literal text ""

Positive Lookahead(?=")

"the literal " (34₁₀ / 42₈ / 22₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

\s*"\s*([^ "]+)"\s*(?=[">])|(?<=")("")(?=")

New

<img src="imagename=g1" alt = "">
<img src="imagename="g1"" alt = """">
<img src="imagename="g1"" alt = ""abc"">

$1

<img src="imagename=g1" alt = "">
<img src="imagename="g1"" alt = """">
<img src="imagename="g1"" alt = ""abc"">