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
/
^\/(?!direct-payments-survey)(directpayment|direct-payment).*
/
gm
^ asserts position at start of a line
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
Negative Lookahead
(?!direct-payments-survey)
Assert that the Regex below does not match
direct-payments-survey
matches the characters direct-payments-survey literally (case sensitive)
1st Capturing Group
(directpayment|direct-payment)
1st Alternative
directpayment
directpayment
matches the characters directpayment literally (case sensitive)
2nd Alternative
direct-payment
direct-payment
matches the characters direct-payment literally (case sensitive)
.
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)
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