Regular Expressions 101

Explanation

Pro

(?s)applies the following effective flags to the remainder of the pattern: gms

s modifier: single line. Allows a dot to match line terminators

Non-Capturing Group(?:\G(?!\A)|<p(?:\s[^>]*)?\sclass="(?:[^"]*\s)?c01[\s"])

1st Alternative\G(?!\A)

\Gstart of current search

Negative Lookahead(?!\A)

\Astart of string

2nd Alternative<p(?:\s[^>]*)?\sclass="(?:[^"]*\s)?c01[\s"]

<pthe literal text <p (case sensitive)

Non-Capturing Group(?:\s[^>]*)?

?repeats the group contents below at most once:

\sany whitespace character

Negated Character Class[^>]*

*matches any number of characters outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

\sany whitespace character

class="the literal text class=" (case sensitive)

Non-Capturing Group(?:[^"]*\s)?

?repeats the group contents below at most once:

Negated Character Class[^"]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

\sany whitespace character

c01the literal text c01 (case sensitive)

Character Class[\s"]

\sany whitespace character

"the literal " (34₁₀ / 42₈ / 22₁₆)

Non-Capturing Group(?:(?!<p[\s>]).)*?

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

Negative Lookahead(?!<p[\s>])

<pthe literal text <p (case sensitive)

Character Class[\s>]

\sany whitespace character

>the literal > (62₁₀ / 76₈ / 3E₁₆)

.any character

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Positive Lookahead(?=.*?</p>)

.*?any character, repeated any number of times

</p>the literal text </p> (case sensitive)

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?s)(?:\G(?!\A)|<p(?:\s[^>]*)?\sclass="(?:[^"]*\s)?c01[\s"])(?:(?!<p[\s>]).)*?\K\.(?=.*?</p>)

<p class="c01 c02">lorem ipsum. dolor sit. amet sed.</p>
<p class="c01 c02 c03 nnn>lorem ipsum. dolor sit. amet sed.</p>
<p class="c00 c01 c02 c03 nnn>lorem ipsum. dolor sit. amet sed.</p>
<p class="c00 c01-1 c02 c03 nnn>lorem ipsum. dolor sit. amet sed.</p>

Extraction

<p class="c01 c02">lorem ipsum. dolor sit. amet sed.</p>
<p class="c01 c02 c03 nnn>lorem ipsum. dolor sit. amet sed.</p>
<p class="c00 c01 c02 c03 nnn>lorem ipsum. dolor sit. amet sed.</p>
<p class="c00 c01-1 c02 c03 nnn>lorem ipsum. dolor sit. amet sed.</p>