Regular Expressions 101

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/
^(((h..ps|f.p):\/\/)?(?:([\w\-\.])+(\[\.\])([\w]){2,4}|(?:(?:25[0-5]|2[0-4]\d|[01]\d\d)\[\.\]){3}(?:25[0-5]|2[0-4]\d|[01]\d\d)))*([\w\/+=%&_\.~?\-])$
/
gm
^ asserts position at start of a line
1st Capturing Group
(((h..ps|f.p):\/\/)?(?:([\w\-\.])+(\[\.\])([\w]){2,4}|(?:(?:25[0-5]|2[0-4]\d|[01]\d\d)\[\.\]){3}(?:25[0-5]|2[0-4]\d|[01]\d\d)))*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
2nd Capturing Group
((h..ps|f.p):\/\/)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
3rd Capturing Group
(h..ps|f.p)
1st Alternative
h..ps
h matches the character h literally (case sensitive)
. matches any character (except for line terminators)
. matches any character (except for line terminators)
p matches the character p literally (case sensitive)
s
matches the character s literally (case sensitive)
2nd Alternative
f.p
: matches the character : literally (case sensitive)
\/ matches the character / literally (case sensitive)
\/ matches the character / literally (case sensitive)
Non-capturing group
(?:([\w\-\.])+(\[\.\])([\w]){2,4}|(?:(?:25[0-5]|2[0-4]\d|[01]\d\d)\[\.\]){3}(?:25[0-5]|2[0-4]\d|[01]\d\d))
1st Alternative
([\w\-\.])+(\[\.\])([\w]){2,4}
4th Capturing Group
([\w\-\.])+
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
Match a single character present in the list below
[\w\-\.]
5th Capturing Group
(\[\.\])
\[
matches the character [ literally (case sensitive)
\. matches the character . literally (case sensitive)
\]
matches the character ] literally (case sensitive)
6th Capturing Group
([\w]){2,4}
2nd Alternative
(?:(?:25[0-5]|2[0-4]\d|[01]\d\d)\[\.\]){3}(?:25[0-5]|2[0-4]\d|[01]\d\d)
Non-capturing group
(?:(?:25[0-5]|2[0-4]\d|[01]\d\d)\[\.\]){3}
{3} matches the previous token exactly 3 times
Non-capturing group
(?:25[0-5]|2[0-4]\d|[01]\d\d)
\[
matches the character [ literally (case sensitive)
\. matches the character . literally (case sensitive)
\]
matches the character ] literally (case sensitive)
Non-capturing group
(?:25[0-5]|2[0-4]\d|[01]\d\d)
7th Capturing Group
([\w\/+=%&_\.~?\-])
Match a single character present in the list below
[\w\/+=%&_\.~?\-]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\w matches any word character (equivalent to [a-zA-Z0-9_])
\/ matches the character / literally (case sensitive)
+=%&_ matches a single character in the list +=%&_ (case sensitive)
\. matches the character . literally (case sensitive)
~? matches a single character in the list ~? (case sensitive)
\- matches the character - literally (case sensitive)
$ asserts position at the end of a line
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String