Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
mig

Test String

Code Generator

Language

Generated Code

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r"(?mi)^(?=(?:\+|0{2})?(?:(?:[\(\-\)\t\f ]*\d){7,10})?(?:[\t\f ]?\d{2,3})(?:[\-\s]?[ext]{1,3}[\-\t\f ]?\d{1,4})?$)((?:\+|0{2})\d{0,3})?(?:[\-\t\f ]?)(\(0?\d{1,3}\)|\d{0,3})(?:[\-\t\f ]{0,2}\d){3,}(?:[\-\s]?(?:x|ext)[\-\t\f ]?(\d{1,4}))?$").unwrap(); let string = "123456789 1234567890123456 1234567890123 0091234567890 +9 123-4567890-x321 +9-123-456-7890 +9 123 4 5 6-7890x1234 009-(123)-456-7890 ext4321 0091234567890x1234 +9-123-456-7890x12345 +9-123-456-7890 ext 1234 0027-123-456-7890 +27-123-456-7890 +9(123)4567890 911 (0)123456789 +34123456789 +34 (0)123456789 +340123456789 +34 123 456 789 +34 1 23 45 67 89 001230123456789 ext1234 ++34123456789 00-0-----000 01 555012345 001-555012345 +012345678 112 12(34567890 123)456789012345 "; // result will be an iterator over tuples containing the start and end indices for each match in the string let result = regex.captures_iter(string); for mat in result { println!("{:?}", mat); } }

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 Rust, please visit: https://docs.rs/regex/latest/regex/