Regular Expressions 101

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

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  • Unit Tests (17)

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/
^(?<weeks>\d{1,2})w\s(?<days>0?[0-6])d\s(?<hours>(?:0?|1|2(?=[0-3]))\d)h\s(?<minutes>(?:0?|[1-5])\d)m$
/
i
All the errors detected are listed below, from left to right, as they appear in the pattern.
? The preceding token is not quantifiable
? The preceding token is not quantifiable
? The preceding token is not quantifiable
? The preceding token is not quantifiable
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
i

Test String

Code Generator

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Generated Code

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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 Golang, please visit: https://golang.org/pkg/regexp/

Regular Expressions 101

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