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C#
capturing
    .Net framework
    Java (java.util.regex)
    JavaScript
    PCRE lib
    PHP
    Python
    shell tools
    vi editor
case-insensitive mode
character classes
    and class-like constructs
        .Net framework
        Java (java.util.regex)
        JavaScript
        PCRE lib
        Perl Version 5.8
        PHP
        shell tools
    POSIX
character representations
    .Net framework
    Java (java.util.regex)
    JavaScript
    PCRE lib
    Perl Version 5.8
    PHP
    Python
    shell tools
    vi editor
character shorthands
CharSequence interface
class shorthands
classes (Java (java.util.regex))
combining character sequence, Unicode
comments
    .Net framework
    Java (java.util.regex)
    PCRE lib
    Perl 5.8
    PHP
    Python
    shell tools
compile function (Python)
conditional
    .Net framework
    Java (java.util.regex)
    JavaScript
    PCRE lib
    PHP
    Python
    shell tools
    vi editor
control
    .Net framework
    Java (java.util.regex)
    JavaScript
    shell tools
    vi editor
control characters