regex101: Last SEO RegExp

Negative Lookbehind(?<!(?=((http|https|ftp|ftps?)\:\/\/?)(www\.?)))

Positive Lookahead(?=((http|https|ftp|ftps?)\:\/\/?)(www\.?))

Group 1((http|https|ftp|ftps?)\:\/\/?)

Group 2(http|https|ftp|ftps?)

1st Alternativehttp

httpthe literal text http (case insensitive)

2nd Alternativehttps

httpsthe literal text https (case insensitive)

3rd Alternativeftp

ftpthe literal text ftp (case insensitive)

4th Alternativeftps?

ftpthe literal text ftp (case insensitive)

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

\:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 3(www\.?)

wwwthe literal text www (case insensitive)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

Nissanthe literal text Nissan (case insensitive)

Negative Lookahead(?!(?:([$&+.,/:;\-_#=@?!a-zA-Z0-9](?!\s))+))

Non-Capturing Group(?:([$&+.,/:;\-_#=@?!a-zA-Z0-9](?!\s))+)

Group 4([$&+.,/:;\-_#=@?!a-zA-Z0-9](?!\s))+

+repeats the group contents below at least once:

Character Class[$&+.,/:;\-_#=@?!a-zA-Z0-9]

$the literal $ (36₁₀ / 44₈ / 24₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Negative Lookahead(?!\s)

\sa Unicode whitespace character

Positive Lookahead(?=[^<>]*<)

Negated Character Class[^<>]*

*matches any number of characters outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Negative Lookahead(?!(?:(?!</?(?:a|span)[ >/])(?:.|\n))*</(?:a|span)>)

Non-Capturing Group(?:(?!</?(?:a|span)[ >/])(?:.|\n))*

*repeats the group contents below any number of times:

Negative Lookahead(?!</?(?:a|span)[ >/])

<the literal < (60₁₀ / 74₈ / 3C₁₆)

/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:a|span)

1st Alternativea

athe literal a (97₁₀ / 141₈ / 61₁₆) (case insensitive)

2nd Alternativespan

spanthe literal text span (case insensitive)

Character Class[ >/]

the literal (32₁₀ / 40₈ / 20₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:.|\n)

1st Alternative.

.any Unicode character (except for line terminators)

2nd Alternative\n

</the literal text </

Non-Capturing Group(?:a|span)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Negative Lookahead(?! (Micra|is))

Global pattern flags

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Search reference

Regular Expression

(?<!(?=((http|https|ftp|ftps?)\:\/\/?)(www\.?)))Nissan(?!(?:([$&+.,/:;\-_#=@?!a-zA-Z0-9](?!\s))+))(?=[^<>]*<)(?!(?:(?!</?(?:a|span)[ >/])(?:.|\n))*</(?:a|span)>)(?! (Micra|is))

New

<p>Nissan is car manufacter odoocompany.</p>
<p>Nissan</p>
<p>Nissan. Nissan, Nissan: 'Nissan' "Nissan" Nissan. </p>
<p>niss  'Nissan' niss</p>
<p>[Nissan] (Nissan)</p>
<p>Nissan! www.Nissan.com and www.Nissan.co.in/?nissan=/Nissan.php </p>
<p>Nissan! www.Nissan.com/nissanis/nissan01/nissan_-ABC/nissan.com</p>
<p>nissan.com/nissan.html nissan company Nissan Micra is product</p>
<p><a href="www.Nissan.com">Nissan</a> is company and <span><a href="www.Nissan.com">Nissan</a></span> Micra is product</p>
<p><span>Nissan</span></p>
<p>Nissan product <a href="Nissan.com">Nissan</a> ignore Nissan</p>
<p>nissan <a href="Nissan.com"><span>Nissan</span></a> new nissan</p>
<p>odoo is a name Company and Nissan Micra is a model of best.</p>

<p>This is new <a href='https://www.Nissan.com'><span>Nissan</span></a> micra of micra nissan is company.
nissan is a company.</p>

Regular Expressions 101

Regular Expression

Substitution