regex101: PCRE (Legacy) Substitution Workspace

^start of line

<img src="index-the literal text <img src="index- (case sensitive)

Negative Lookahead(?![12]_)

Character Class[12]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 1(\d+)

\d+a digit, repeated at least once

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:jpg|png)

1st Alternativejpg

jpgthe literal text jpg (case sensitive)

2nd Alternativepng

pngthe literal text png (case sensitive)

"the literal " (34₁₀ / 42₈ / 22₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

><br>the literal text ><br> (case sensitive)

$end of line

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

25 tokens

Regular Expression

^<img src="index-(?![12]_)(\d+)_\d+\.(?:jpg|png)"\/><br>$

New

<img src="index-1_2.jpg"/><br>
<img src="index-1_3.jpg"/><br>
<img src="index-1_5.jpg"/><br>
<img src="index-2_1.jpg"/><br>
<img src="index-2_5.jpg"/><br>
<img src="index-3_1.png"/><br>
<img src="index-23_8.png"/><br>
<img src="index-22_9.png"/><br>
<img src="index-22_1.jpg"/><br>
<img src="index-22_2.jpg"/><br>
<img src="index-99_5.png"/><br>
<img src="index-100_5.png"/><br>
<img src="index-1000_5.png"/><br>

Extraction

<img src="index-1_2.jpg"/><br>
<img src="index-1_3.jpg"/><br>
<img src="index-1_5.jpg"/><br>
<img src="index-2_1.jpg"/><br>
<img src="index-2_5.jpg"/><br>
<img src="index-3_1.png"/><br>
<img src="index-23_8.png"/><br>
<img src="index-22_9.png"/><br>
<img src="index-22_1.jpg"/><br>
<img src="index-22_2.jpg"/><br>
<img src="index-99_5.png"/><br>
<img src="index-100_5.png"/><br>
<img src="index-1000_5.png"/><br>