regex101: PCRE (Legacy) Match Workspace

Group 1((?:<\s*img[^>]+?src=\s*["']))

Non-Capturing Group(?:<\s*img[^>]+?src=\s*["'])

<the literal < (60₁₀ / 74₈ / 3C₁₆)

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

imgthe literal text img (case sensitive)

Negated Character Class[^>]+?

+?matches at least one character outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

src=the literal text src= (case sensitive)

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

Character Class["']

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Negative Lookahead(?!https?:\/\/)

httpthe literal text http (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 2([^'"]*?\..*?)

Negated Character Class[^'"]*?

*?matches any number of characters outside the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

.*?any character (except for line terminators), repeated any number of times

Positive Lookahead(?=["'].*?>)

Character Class["']

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

.*?any character (except for line terminators), repeated any number of times

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Global pattern flags

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

Search reference

Regular Expression

((?:<\s*img[^>]+?src=\s*["']))(?!https?:\/\/)([^'"]*?\..*?)(?=["'].*?>)

New

TO MATCH:<img src="images/vendor.png" alt="" > <img src="images/vendor.gif" class="box-bg-image" alt="" ><img src="images/vendor-dp-20141009-flatware.jpg" class="box-bg-image" alt="" ><img src="images/vendor-flatware.jpeg" class="box" alt="" ><img src='images/vendor-flatware.jpeg' class="box" ><img alt="" src='images/vendor-flatware.jpeg' alt="" ><img src=' images/vendor-flatware.jpg' alt="" ><img src=' images/vendor-flatware.gif' alt="" ><img src=' images/vendor-flatware.png ' alt="" ><img src='../silverware.png' alt="" ><img class="box" src='images/vendor-watch.png' alt="" ><img src=" images/vendor-flatware.jpeg " alt="" >< img src="images/vendor-flatware.jpeg " alt="" >< img src="images/vendor-flatware.jpeg " alt="" ><img src="vendor.gif" alt="">

NOT TO MATCH:<img src="http://thirdpartycdn.com/image.jpg"><img src='http://thirdpartycdn.com/image.png'><img src="http://thirdpartycdn.com/image.gif" class="box-bg-image" alt="">img src="images/vendor-flatware.jpeg "<img src="images/vendorpng" alt="" >EXTRA MARKUP FOR TESTING IN AN ATTEMPT TO CREATE AN ERROR<link rel="stylesheet" href="css/styles.css" type="text/css"><style type="text/css"> .burgers{font-size:6em;}</style><a class="" href="">Hello world!</a>

Regular Expressions 101

Regular Expression

Substitution