Regular Expressions 101

Save & Share

  • Save Regex
    ctrl+s
  • Update Regex
    ctrl+⇧+s

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8

Function

  • Match
  • Substitution
  • List
  • Unit Tests
/
([\d]{2}\/[\d]{2}\/[\d]{4})[\s]([\d]{2}:[\d]{2}:[\d]{2}\.[\d]{2})\sid:\s([\d]{4})\sseq:\s([\d]{4})[\s<>]*type:\s([\da-f]{4})\slen:[\s]*([\d]{2})\s([\w]*)
/
g
1st Capturing Group
([\d]{2}\/[\d]{2}\/[\d]{4})
Match a single character present in the list below
[\d]
{2} matches the previous token exactly 2 times
\d matches a digit (equivalent to [0-9])
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
Match a single character present in the list below
[\d]
{2} matches the previous token exactly 2 times
\d matches a digit (equivalent to [0-9])
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
Match a single character present in the list below
[\d]
{4} matches the previous token exactly 4 times
\d matches a digit (equivalent to [0-9])
Match a single character present in the list below
[\s]
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
2nd Capturing Group
([\d]{2}:[\d]{2}:[\d]{2}\.[\d]{2})
Match a single character present in the list below
[\d]
{2} matches the previous token exactly 2 times
\d matches a digit (equivalent to [0-9])
: matches the character : with index 5810 (3A16 or 728) literally (case sensitive)
Match a single character present in the list below
[\d]
{2} matches the previous token exactly 2 times
\d matches a digit (equivalent to [0-9])
: matches the character : with index 5810 (3A16 or 728) literally (case sensitive)
Match a single character present in the list below
[\d]
{2} matches the previous token exactly 2 times
\d matches a digit (equivalent to [0-9])
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
Match a single character present in the list below
[\d]
{2} matches the previous token exactly 2 times
\d matches a digit (equivalent to [0-9])
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
id:
matches the characters id: literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
3rd Capturing Group
([\d]{4})
Match a single character present in the list below
[\d]
{4} matches the previous token exactly 4 times
\d matches a digit (equivalent to [0-9])
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
seq:
matches the characters seq: literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
4th Capturing Group
([\d]{4})
Match a single character present in the list below
[\d]
{4} matches the previous token exactly 4 times
\d matches a digit (equivalent to [0-9])
Match a single character present in the list below
[\s<>]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
<>
matches a single character in the list <> (case sensitive)
type:
matches the characters type: literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
5th Capturing Group
([\da-f]{4})
Match a single character present in the list below
[\da-f]
{4} matches the previous token exactly 4 times
\d matches a digit (equivalent to [0-9])
a-f matches a single character in the range between a (index 97) and f (index 102) (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
len:
matches the characters len: literally (case sensitive)
Match a single character present in the list below
[\s]
6th Capturing Group
([\d]{2})
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
7th Capturing Group
([\w]*)
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