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
"
<a class=\"Anchor-qkwhxv-0 cRgrlM\" href=\"([^\"]+)\"
"
gm
<a class=
matches the characters <a class= literally (case sensitive)
\" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
Anchor-qkwhxv-0 cRgrlM
matches the characters Anchor-qkwhxv-0 cRgrlM literally (case sensitive)
\" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
href=
matches the characters href= literally (case sensitive)
\" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
1st Capturing Group
([^\"]+)
Match a single character not present in the list below
[^\"]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
\" matches the character " with index 3410 (2216 or 428) 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.

Regular Expression
No Match

r"
"
gm

Test String