Regex

Regex is based on PCRE (Perl Compatible Regular Expressions) and built on top of Erlang's :re module. More information can be found in the :re module documentation.

# A simple regular expression that matches foo anywhere in the string
~r/foo/

# A regular expression with case insensitive and Unicode options
~r/foo/iu

#Internally a struct so matches
~r/(?<foo>.)(?<bar>.)/ == ~r/(?<foo>.)(?<bar>.)/


~r/https?.*example\d?\.com$/
~r/https?.*eta-pr-[[:digit:]]+.onrender.com$/ #matches "https://eta-pr-455.onrender.com" where number can change

Usage

String.match?("123", ~r/^[[:alnum:]]+$/) #true
String.match?("123 456", ~r/^[[:alnum:][:blank:]]+$/) #true

The supported class names are:

  • alnum - Letters and digits

  • alpha - Letters

  • ascii - Character codes 0-127

  • blank - Space or tab only

  • cntrl - Control characters

  • digit - Decimal digits (same as \d)

  • graph - Printing characters, excluding space

  • lower - Lowercase letters

  • print - Printing characters, including space

  • punct - Printing characters, excluding letters, digits, and space

  • space - Whitespace (the same as \s from PCRE 8.34)

  • upper - Uppercase letters

  • word - "Word" characters (same as \w)

  • xdigit - Hexadecimal digits

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