Regular Expressions 101

@regex101
Donate
Sponsor
Contact
Bug Reports & Feedback
Wiki
Whats new?

Save & Share

  • Save Regex
    ctrl+s
  • Update Regex
    ctrl+⇧+s

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python 2.7
  • Golang
  • Java 8

Function

  • Match
  • Substitution
  • List
  • Unit Tests
/
(?m)^(.),"(.)","([^,])",
/
gu
(?m)
match the remainder of the pattern with the following effective flags: gum
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
^ asserts position at start of a line
1st Capturing Group
(.)
.
matches any character, including unicode (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
," matches the characters ," literally (case sensitive)
2nd Capturing Group
(.)
.
matches any character, including unicode (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
"," matches the characters "," literally (case sensitive)
3rd 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 , literally (case sensitive)
", matches the characters ", literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
u modifier: unicode. Pattern strings are treated as UTF-16. Also causes escape sequences to match unicode characters
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gu

Test String