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
/
(?:\[)(?<StiffenerName>(?:.*?))\s*(?=s\=|S\=)(?<StiffenerFactorSGroup>(?:s\=|S\=)(?<StiffenerFactorS>(?:\d)+(?:\.(?:\d)+)?))(?:\s*)(?<StiffenerMaterialGroup>(?:\*)(?<StiffenerMaterial>.*)(?:\*))?(?:\s*)(?:\])
/
gm
Non-capturing group
(?:\[)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
Named Capture Group StiffenerName
(?<StiffenerName>(?:.*?))
Non-capturing group
(?:.*?)
.
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)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Positive Lookahead
(?=s\=|S\=)
Assert that the Regex below matches
1st Alternative
s\=
s matches the character s with index 11510 (7316 or 1638) literally (case sensitive)
\= matches the character = with index 6110 (3D16 or 758) literally (case sensitive)
2nd Alternative
S\=
S matches the character S with index 8310 (5316 or 1238) literally (case sensitive)
\= matches the character = with index 6110 (3D16 or 758) literally (case sensitive)
Named Capture Group StiffenerFactorSGroup
(?<StiffenerFactorSGroup>(?:s\=|S\=)(?<StiffenerFactorS>(?:\d)+(?:\.(?:\d)+)?))
Non-capturing group
(?:s\=|S\=)
1st Alternative
s\=
s matches the character s with index 11510 (7316 or 1638) literally (case sensitive)
\= matches the character = with index 6110 (3D16 or 758) literally (case sensitive)
2nd Alternative
S\=
S matches the character S with index 8310 (5316 or 1238) literally (case sensitive)
\= matches the character = with index 6110 (3D16 or 758) literally (case sensitive)
Named Capture Group StiffenerFactorS
(?<StiffenerFactorS>(?:\d)+(?:\.(?:\d)+)?)
Non-capturing group
(?:\d)+
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\d matches a digit (equivalent to [0-9])
Non-capturing group
(?:\.(?:\d)+)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
Non-capturing group
(?:\d)+
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\d matches a digit (equivalent to [0-9])
Non-capturing group
(?:\s*)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Named Capture Group StiffenerMaterialGroup
(?<StiffenerMaterialGroup>(?:\*)(?<StiffenerMaterial>.*)(?:\*))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
Non-capturing group
(?:\*)
\* matches the character * with index 4210 (2A16 or 528) literally (case sensitive)
Named Capture Group StiffenerMaterial
(?<StiffenerMaterial>.*)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Non-capturing group
(?:\*)
\* matches the character * with index 4210 (2A16 or 528) literally (case sensitive)
Non-capturing group
(?:\s*)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Non-capturing group
(?:\])
\] matches the character ] with index 9310 (5D16 or 1358) 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