Regular Expressions 101

Save & Share

Flavor

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

Function

  • Match
  • Substitution
  • List
  • Unit Tests
/
<ns2:([^<]*?) xmlns:ns2|<faultstring>([^<]*?)<\/faultstring>
/
gm
1st Alternative
<ns2:([^<]*?) xmlns:ns2
<ns2:
matches the characters <ns2: literally (case sensitive)
1st Capturing Group
([^<]*?)
Match a single character not present in the list below
[^<]
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
< matches the character < with index 6010 (3C16 or 748) literally (case sensitive)
xmlns:ns2
matches the characters xmlns:ns2 literally (case sensitive)
2nd Alternative
<faultstring>([^<]*?)<\/faultstring>
<faultstring>
matches the characters <faultstring> literally (case sensitive)
2nd Capturing Group
([^<]*?)
Match a single character not present in the list below
[^<]
*? matches the previous token between zero 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 6010 (3C16 or 748) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
faultstring>
matches the characters faultstring> 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