regex101: PCRE (Legacy) Match Workspace

<imgthe literal text <img (case sensitive)

Positive Lookahead(?=\s)

\sany whitespace character

Positive Lookahead(?=(?:[^>"']|"[^"]*"|'[^']*')*?\ssrc\s*=\s*(?:(['"])([\S\s]*?)\1))

Non-Capturing Group(?:[^>"']|"[^"]*"|'[^']*')*?

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

1st Alternative[^>"']

Negated Character Class[^>"']

>the literal > (62₁₀ / 76₈ / 3E₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

2nd Alternative"[^"]*"

"the literal " (34₁₀ / 42₈ / 22₁₆)

Negated Character Class[^"]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

3rd Alternative'[^']*'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Negated Character Class[^']*

*matches any number of characters outside the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

\sany whitespace character

srcthe literal text src (case sensitive)

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

=the literal = (61₁₀ / 75₈ / 3D₁₆)

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

Non-Capturing Group(?:(['"])([\S\s]*?)\1)

Group 1(['"])

Character Class['"]

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

Group 2([\S\s]*?)

Character Class[\S\s]*?

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

\Sany non-whitespace character

\sany whitespace character

\1the text saved by group 1

\s+any whitespace character, repeated at least once

Non-Capturing Group(?:"[\S\s]*?"|'[\S\s]*?'|[^>]*?)+

+repeats the group contents below at least once:

1st Alternative"[\S\s]*?"

"the literal " (34₁₀ / 42₈ / 22₁₆)

Character Class[\S\s]*?

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

\Sany non-whitespace character

\sany whitespace character

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative'[\S\s]*?'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Character Class[\S\s]*?

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

\Sany non-whitespace character

\sany whitespace character

'the literal ' (39₁₀ / 47₈ / 27₁₆)

3rd Alternative[^>]*?

Negated Character Class[^>]*?

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

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

Search reference

Regular Expression

<img(?=\s)(?=(?:[^>"']|"[^"]*"|'[^']*')*?\ssrc\s*=\s*(?:(['"])([\S\s]*?)\1))\s+(?:"[\S\s]*?"|'[\S\s]*?'|[^>]*?)+>

New

<a><img src="imagsource.jpg"width="imageWidth /></a>

Regular Expressions 101

Regular Expression

Substitution