Regular Expressions 101

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/
USERS: ([^!]*[a-zA-Z]\d{3})![^@]+@[^ ]+ \([^) ]+\) \(\S+\) connected to the network
/
gm
USERS:
matches the characters USERS: literally (case sensitive)
1st Capturing Group
([^!]*[a-zA-Z]\d{3})
Match a single character not present in the list below
[^!]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
! matches the character ! with index 3310 (2116 or 418) literally (case sensitive)
Match a single character present in the list below
[a-zA-Z]
a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)
A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)
\d
matches a digit (equivalent to [0-9])
{3} matches the previous token exactly 3 times
! matches the character ! with index 3310 (2116 or 418) literally (case sensitive)
Match a single character not present in the list below
[^@]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
@ matches the character @ with index 6410 (4016 or 1008) literally (case sensitive)
@ matches the character @ with index 6410 (4016 or 1008) literally (case sensitive)
Match a single character not present in the list below
[^ ]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
Match a single character not present in the list below
[^) ]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
)
matches a single character in the list ) (case sensitive)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
\( matches the character ( with index 4010 (2816 or 508) literally (case sensitive)
\S
matches any non-whitespace character (equivalent to [^\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
connected to the network
matches the characters connected to the network literally (case sensitive)
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

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