Regular Expressions 101

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~
(<dependency>\s+<groupId>)(.+)(</groupId>\s+<artifactId>)(.+)(</artifactId>\s+<version>)([^\$]+?)(</version>[\s\S]*?\s+</dependency>)
~
g
1st Capturing Group
(<dependency>\s+<groupId>)
<dependency>
matches the characters <dependency> literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
<groupId>
matches the characters <groupId> literally (case sensitive)
2nd Capturing Group
(.+)
.
matches any character (except for line terminators)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
3rd Capturing Group
(</groupId>\s+<artifactId>)
</groupId>
matches the characters </groupId> literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
<artifactId>
matches the characters <artifactId> literally (case sensitive)
4th Capturing Group
(.+)
.
matches any character (except for line terminators)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
5th Capturing Group
(</artifactId>\s+<version>)
</artifactId>
matches the characters </artifactId> literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
<version>
matches the characters <version> literally (case sensitive)
6th Capturing Group
([^\$]+?)
Match a single character not present in the list below
[^\$]
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
\$ matches the character $ with index 3610 (2416 or 448) literally (case sensitive)
7th Capturing Group
(</version>[\s\S]*?\s+</dependency>)
</version>
matches the characters </version> literally (case sensitive)
Match a single character present in the list below
[\s\S]
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
\S matches any non-whitespace character (equivalent to [^\r\n\t\f\v ])
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
</dependency>
matches the characters </dependency> literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

~
~
g

Test String

Code Generator

Generated Code

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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php