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
/
^\s*((?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]*|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?)?\s*(?:,\s*((?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?))?\s*(?:,\s*((?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?))?\s*$
/
g
^ asserts position at start of the string
\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)
1st Capturing Group
((?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]*|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
Non-capturing group
(?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]*|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
1st Alternative
(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]*|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])
Non-capturing group
(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]*|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])
Match a single character present in the list below
['"([{]
'"([{
matches a single character in the list '"([{ (case sensitive)
Non-capturing group
(?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]*|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
1st Alternative
[^'"()[\]{}]*
Match a single character not present in the list below
[^'"()[\]{}]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
'"()[
matches a single character in the list '"()[ (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
{}
matches a single character in the list {} (case sensitive)
2nd Alternative
['"([{](?:[^'"()[\]{}]*|['"([{][^'"()[\]{}]*['")}\]])*['")}\]]
Match a single character present in the list below
['"([{]
'"([{
matches a single character in the list '"([{ (case sensitive)
Non-capturing group
(?:[^'"()[\]{}]*|['"([{][^'"()[\]{}]*['")}\]])*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
1st Alternative
[^'"()[\]{}]*
Match a single character not present in the list below
[^'"()[\]{}]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
'"()[
matches a single character in the list '"()[ (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
{}
matches a single character in the list {} (case sensitive)
2nd Alternative
['"([{][^'"()[\]{}]*['")}\]]
Match a single character present in the list below
['"([{]
'"([{
matches a single character in the list '"([{ (case sensitive)
Match a single character not present in the list below
[^'"()[\]{}]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
'"()[
matches a single character in the list '"()[ (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
{}
matches a single character in the list {} (case sensitive)
Match a single character present in the list below
['")}\]]
'")}
matches a single character in the list '")} (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
Match a single character present in the list below
['")}\]]
'")}
matches a single character in the list '")} (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
Match a single character present in the list below
['")}\]]
'")}
matches a single character in the list '")} (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
2nd Alternative
[^,]
Match a single character not present in the list below
[^,]
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
\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
(?:,\s*((?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
\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)
2nd Capturing Group
((?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?)
Non-capturing group
(?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
1st Alternative
(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])
Non-capturing group
(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])
Match a single character present in the list below
['"([{]
'"([{
matches a single character in the list '"([{ (case sensitive)
Non-capturing group
(?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
1st Alternative
[^'"()[\]{}]*
Match a single character not present in the list below
[^'"()[\]{}]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
'"()[
matches a single character in the list '"()[ (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
{}
matches a single character in the list {} (case sensitive)
2nd Alternative
['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]]
Match a single character present in the list below
['"([{]
'"([{
matches a single character in the list '"([{ (case sensitive)
Non-capturing group
(?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
1st Alternative
[^'"()[\]{}]+
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 a single character in the list '"()[ (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
{}
matches a single character in the list {} (case sensitive)
2nd Alternative
['"([{][^'"()[\]{}]*['")}\]]
Match a single character present in the list below
['"([{]
'"([{
matches a single character in the list '"([{ (case sensitive)
Match a single character not present in the list below
[^'"()[\]{}]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
'"()[
matches a single character in the list '"()[ (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
{}
matches a single character in the list {} (case sensitive)
Match a single character present in the list below
['")}\]]
'")}
matches a single character in the list '")} (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
Match a single character present in the list below
['")}\]]
'")}
matches a single character in the list '")} (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
Match a single character present in the list below
['")}\]]
'")}
matches a single character in the list '")} (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
2nd Alternative
[^,]
Match a single character not present in the list below
[^,]
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
\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
(?:,\s*((?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
\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)
3rd Capturing Group
((?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?)
Non-capturing group
(?:(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])|[^,])*?
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
1st Alternative
(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])
Non-capturing group
(?:['"([{](?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*['")}\]])
Match a single character present in the list below
['"([{]
'"([{
matches a single character in the list '"([{ (case sensitive)
Non-capturing group
(?:[^'"()[\]{}]*|['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]])*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
1st Alternative
[^'"()[\]{}]*
Match a single character not present in the list below
[^'"()[\]{}]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
'"()[
matches a single character in the list '"()[ (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
{}
matches a single character in the list {} (case sensitive)
2nd Alternative
['"([{](?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*['")}\]]
Match a single character present in the list below
['"([{]
'"([{
matches a single character in the list '"([{ (case sensitive)
Non-capturing group
(?:[^'"()[\]{}]+|['"([{][^'"()[\]{}]*['")}\]])*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
1st Alternative
[^'"()[\]{}]+
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 a single character in the list '"()[ (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
{}
matches a single character in the list {} (case sensitive)
2nd Alternative
['"([{][^'"()[\]{}]*['")}\]]
Match a single character present in the list below
['"([{]
'"([{
matches a single character in the list '"([{ (case sensitive)
Match a single character not present in the list below
[^'"()[\]{}]
Match a single character present in the list below
['")}\]]
Match a single character present in the list below
['")}\]]
'")}
matches a single character in the list '")} (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
Match a single character present in the list below
['")}\]]
'")}
matches a single character in the list '")} (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
2nd Alternative
[^,]
Match a single character not present in the list below
[^,]
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
\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)
$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String

Code Generator

Generated Code

Loading code sample...
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report.
For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php