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
/
^(1|B)[A-Z0-9]{6}\.1L[1-9]{1}$
/
gm
^ asserts position at start of a line
1st Capturing Group
(1|B)
1st Alternative
1
1 matches the character 1 with index 4910 (3116 or 618) literally (case sensitive)
2nd Alternative
B
B matches the character B with index 6610 (4216 or 1028) literally (case sensitive)
Match a single character present in the list below
[A-Z0-9]
{6} matches the previous token exactly 6 times
A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)
0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
1L
matches the characters 1L literally (case sensitive)
Match a single character present in the list below
[1-9]
{1} matches the previous token exactly one time (meaningless quantifier)
1-9 matches a single character in the range between 1 (index 49) and 9 (index 57) (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

Code Generator

Generated Code

Loading code sample...
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