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
/
(?-s)(^.+\R){2}^.+?<name>([^<]+?|)'.+\R(?s).+?<\/customer>
/
gm
(?-s)
match the remainder of the pattern with the following effective flags: gm
s modifier: -single line. A dot won't match \n
1st Capturing Group
(^.+\R){2}
{2} matches the previous token exactly 2 times
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
^ asserts position at start of a line
.
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)
\R matches any Unicode newline sequence
^ asserts position at start of a line
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
<name>
matches the characters <name> literally (case sensitive)
2nd Capturing Group
([^<]+?|)
1st Alternative
[^<]+?
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 6010 (3C16 or 748) literally (case sensitive)
2nd Alternative null, matches any position
' matches the character ' with index 3910 (2716 or 478) literally (case sensitive)
.
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)
\R matches any Unicode newline sequence
(?s)
match the remainder of the pattern with the following effective flags: gms
s modifier: single line. Dot matches newline characters
.
matches any character
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
< matches the character < with index 6010 (3C16 or 748) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
customer>
matches the characters customer> 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