Regular Expressions 101

<item>the literal text <item> (case insensitive)

.*?any character, repeated any number of times

<id>the literal text <id> (case insensitive)

Group 1((?:(?!<id>).)*?)

Non-Capturing Group(?:(?!<id>).)*?

*?repeats the group contents below any number of times:

Negative Lookahead(?!<id>)

<id>the literal text <id> (case insensitive)

.any character

</id>the literal text </id> (case insensitive)

Non-Capturing Group(?:(?!<item>).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!<item>)

<item>the literal text <item> (case insensitive)

.any character

<img>the literal text <img> (case insensitive)

Group 2(.*?)

.*?any character, repeated any number of times

</img>the literal text </img> (case insensitive)

.*?any character, repeated any number of times

</item>the literal text </item> (case insensitive)

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

<item>.*?<id>((?:(?!<id>).)*?)</id>(?:(?!<item>).)*<img>(.*?)</img>.*?</item>

New

<set>
<item>
    <id>1</id>
    <title>title1</title>
</item>
<item>
    <id>2</id>
    <title>title2</title>
</item>
<item>
    <id>3</id>
    <title>title3</title>
    <img>img3</img>
</item> 
</set>

Regular Expression

Extraction