Regular Expressions 101

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

Condition(?(?=\A).*?<script[^>]*>)

Uses the first branch if the lookaround matches

Positive Lookahead(?=\A)

\Astart of string

If the condition is true, match this branch:.*?<script[^>]*>

.*?any character, repeated any number of times

<scriptthe literal text <script (case sensitive)

Negated Character Class[^>]*

*matches any number of characters outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

.*?any character, repeated any number of times

Non-Capturing Group(?:\K\/\/|<\/script>.*?(?:<script[^>]*>|\z)(*SKIP)(*FAIL))

1st Alternative\K\/\/

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative<\/script>.*?(?:<script[^>]*>|\z)(*SKIP)(*FAIL)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

script>the literal text script> (case sensitive)

.*?any character, repeated any number of times

Non-Capturing Group(?:<script[^>]*>|\z)

1st Alternative<script[^>]*>

<scriptthe literal text <script (case sensitive)

Negated Character Class[^>]*

*matches any number of characters outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

2nd Alternative\z

\zend of string

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*FAIL)forces the current match attempt to fail at this position

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

No unit tests · Add a test to get started

25 tokens

(?s)(?(?=\A).*?<script[^>]*>).*?(?:\K\/\/|<\/script>.*?(?:<script[^>]*>|\z)(*SKIP)(*FAIL))

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