Regular Expressions 101

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

Save & Share

Flavor

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

Function

  • Match
  • Substitution
  • List
  • Unit Tests
/
^([+]\d[-\s]|)\d[-\s]\d[-\s]\d$
/
^ asserts position at start of the string
1st Capturing Group
([+]\d[-\s]|)
1st Alternative
[+]\d[-\s]
Match a single character present in the list below
[+]
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
+ matches the character + literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
{1,2} matches the previous token between 1 and 2 times, as many times as possible, giving back as needed (greedy)
Match a single character present in the list below
[-\s]
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
- matches the character - literally (case sensitive)
This hyphen is treated literally, which might be confusing for others. Consider escaping it or placing at the start or end of the class!
\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
2nd Alternative null, matches any position
\d
matches a digit (equivalent to [0-9])
{3} matches the previous token exactly 3 times
Match a single character present in the list below
[-\s]
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
- matches the character - literally (case sensitive)
This hyphen is treated literally, which might be confusing for others. Consider escaping it or placing at the start or end of the class!
\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
\d
matches a digit (equivalent to [0-9])
{3} matches the previous token exactly 3 times
Match a single character present in the list below
[-\s]
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
- matches the character - literally (case sensitive)
This hyphen is treated literally, which might be confusing for others. Consider escaping it or placing at the start or end of the class!
\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
\d
matches a digit (equivalent to [0-9])
{4} matches the previous token exactly 4 times
$ asserts position at the end of the string
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/

Test String