Regular Expressions 101

Pro

1st Alternative {2}

{2}the literal (32₁₀ / 40₈ / 20₁₆) , repeated exactly 2 times

2nd Alternative\r\n

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

3rd Alternative&(?!(#\d+|\w+);)

&the literal & (38₁₀ / 46₈ / 26₁₆)

Negative Lookahead(?!(#\d+|\w+);)

Group 1(#\d+|\w+)

1st Alternative#\d+

#the literal # (35₁₀ / 43₈ / 23₁₆)

\d+a digit, repeated at least once

2nd Alternative\w+

\w+any word character, repeated at least once

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

4th Alternative[<>\r\n'"`]

Character Class[<>\r\n'"`]

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

`the literal ` (96₁₀ / 140₈ / 60₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

26 tokens

Regular Expression

 {2}|\r\n|&(?!(#\d+|\w+);)|[<>\r\n'"`]

New

 {2}|\r\n|[&(?!(#\\d+|\\w+);)<>\r\n'"`]

&&&amp;   ' ; "<   >
            "http://www.example.com/?a=1&b=2&amp;c=3/",
             "Three in a row: &amp;&&amp;",
            "&lt; is <, &gt; is >, &apos; is ', etc." handle numeric escapes, e.g. &#160; – Jake Cobb Aug 3 '16 at 19:55

Extraction

 {2}|\r\n|[&(?!(#\\d+|\\w+);)<>\r\n'"`]

&&&amp;   ' ; "<   >
            "http://www.example.com/?a=1&b=2&amp;c=3/",
             "Three in a row: &amp;&&amp;",
            "&lt; is <, &gt; is >, &apos; is ', etc." handle numeric escapes, e.g. &#160; – Jake Cobb Aug 3 '16 at 19:55