Regular Expressions 101

Group 1(^|\n)?

?repeats the group contents below at most once:

1st Alternative^

^start of string

2nd Alternative\n

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

<formthe literal text <form (case sensitive)

\ban ASCII word boundary

.*?any character, repeated any number of times

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

form>the literal text form> (case sensitive)

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(^|\n)?<form\b.*?<\/form>

New

<p>Hey I am a boy</p>
<form id='id1' class='class1'>Content</form>
<p>Hey I am a girl</p>
<form id='id1' class='class1'>content</form>