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
"
<coverpage><image l:href=\"#(.*?)\"/></coverpage>
"
gi
<coverpage><image l:href=
matches the characters <coverpage><image l:href= literally (case insensitive)
\" matches the character " with index 3410 (2216 or 428) literally (case insensitive)
# matches the character # with index 3510 (2316 or 438) literally (case insensitive)
1st 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)
\" matches the character " with index 3410 (2216 or 428) literally (case insensitive)
/></coverpage>
matches the characters /></coverpage> literally (case insensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
gi

Test String

Substitution

Processing...