Regular Expressions 101

Pro

Group 1("?example\.com)

"?optionally matches the literal " (34₁₀ / 42₈ / 22₁₆)

examplethe literal text example (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 2(reviews|used-cars)

1st Alternativereviews

reviewsthe literal text reviews (case sensitive)

2nd Alternativeused-cars

used-carsthe literal text used-cars (case sensitive)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 3([^"\s]*[^/"\s])

Negated Character Class[^"\s]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

\sany whitespace character

Negated Character Class[^/"\s]

/the literal / (47₁₀ / 57₈ / 2F₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

\sany whitespace character

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

Group 4("[\s>])?

?repeats the group contents below at most once:

"the literal " (34₁₀ / 42₈ / 22₁₆)

Character Class[\s>]

\sany whitespace character

>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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

("?example\.com)/(reviews|used-cars)/([^"\s]*[^/"\s])/?("[\s>])?

New

<a href="example.com/reviews/audi/a6/" class="button">Link with other attr</a>
<a href="example.com/reviews/audi/a6/">Link without other attr</a>
example.com/reviews/audi/a6

Substitution

$1/$3/$2/$4

<a href="example.com/reviews/audi/a6/" class="button">Link with other attr</a>
<a href="example.com/reviews/audi/a6/">Link without other attr</a>
example.com/reviews/audi/a6