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
"
[^\[\] ](?:\[.*?\])*?(\[\|\])(?:\[.*?\])*?[^\[\] ]
"
mg
Match a single character not present in the list below
[^\[\] ]
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
Non-capturing group
(?:\[.*?\])*?
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
1st Capturing Group
(\[\|\])
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
\| matches the character | with index 12410 (7C16 or 1748) literally (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
Non-capturing group
(?:\[.*?\])*?
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
Match a single character not present in the list below
[^\[\] ]
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
Global pattern flags
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
mg

Test String