Prism.languages.perl = {
	'comment': [
		{
			// POD
			pattern: /(^\s*)=\w+[\s\S]*?=cut.*/m,
			lookbehind: true
		},
		{
			pattern: /(^|[^\\$])#.*/,
			lookbehind: true
		}
	],
	// TODO Could be nice to handle Heredoc too.
	'string': [
		// q/.../
		{
			pattern: /\b(?:q|qq|qx|qw)\s*([^a-zA-Z0-9\s{(\[<])(?:(?!\1)[^\\]|\\[\s\S])*\1/,
			greedy: true
		},

		// q a...a
		{
			pattern: /\b(?:q|qq|qx|qw)\s+([a-zA-Z0-9])(?:(?!\1)[^\\]|\\[\s\S])*\1/,
			greedy: true
		},

		// q(...)
		{
			pattern: /\b(?:q|qq|qx|qw)\s*\((?:[^()\\]|\\[\s\S])*\)/,
			greedy: true
		},

		// q{...}
		{
			pattern: /\b(?:q|qq|qx|qw)\s*\{(?:[^{}\\]|\\[\s\S])*\}/,
			greedy: true
		},

		// q[...]
		{
			pattern: /\b(?:q|qq|qx|qw)\s*\[(?:[^[\]\\]|\\[\s\S])*\]/,
			greedy: true
		},

		// q<...>
		{
			pattern: /\b(?:q|qq|qx|qw)\s*<(?:[^<>\\]|\\[\s\S])*>/,
			greedy: true
		},

		// "...", `...`
		{
			pattern: /("|`)(?:(?!\1)[^\\]|\\[\s\S])*\1/,
			greedy: true
		},

		// '...'
		// FIXME Multi-line single-quoted strings are not supported as they would break variables containing '
		{
			pattern: /'(?:[^'\\\r\n]|\\.)*'/,
			greedy: true
		}
	],
	'regex': [
		// m/.../
		{
			pattern: /\b(?:m|qr)\s*([^a-zA-Z0-9\s{(\[<])(?:(?!\1)[^\\]|\\[\s\S])*\1[msixpodualngc]*/,
			greedy: true
		},

		// m a...a
		{
			pattern: /\b(?:m|qr)\s+([a-zA-Z0-9])(?:(?!\1)[^\\]|\\[\s\S])*\1[msixpodualngc]*/,
			greedy: true
		},

		// m(...)
		{
			pattern: /\b(?:m|qr)\s*\((?:[^()\\]|\\[\s\S])*\)[msixpodualngc]*/,
			greedy: true
		},

		// m{...}
		{
			pattern: /\b(?:m|qr)\s*\{(?:[^{}\\]|\\[\s\S])*\}[msixpodualngc]*/,
			greedy: true
		},

		// m[...]
		{
			pattern: /\b(?:m|qr)\s*\[(?:[^[\]\\]|\\[\s\S])*\][msixpodualngc]*/,
			greedy: true
		},

		// m<...>
		{
			pattern: /\b(?:m|qr)\s*<(?:[^<>\\]|\\[\s\S])*>[msixpodualngc]*/,
			greedy: true
		},

		// The lookbehinds prevent -s from breaking
		// FIXME We don't handle change of separator like s(...)[...]
		// s/.../.../
		{
			pattern: /(^|[^-]\b)(?:s|tr|y)\s*([^a-zA-Z0-9\s{(\[<])(?:(?!\2)[^\\]|\\[\s\S])*\2(?:(?!\2)[^\\]|\\[\s\S])*\2[msixpodualngcer]*/,
			lookbehind: true,
			greedy: true
		},

		// s a...a...a
		{
			pattern: /(^|[^-]\b)(?:s|tr|y)\s+([a-zA-Z0-9])(?:(?!\2)[^\\]|\\[\s\S])*\2(?:(?!\2)[^\\]|\\[\s\S])*\2[msixpodualngcer]*/,
			lookbehind: true,
			greedy: true
		},

		// s(...)(...)
		{
			pattern: /(^|[^-]\b)(?:s|tr|y)\s*\((?:[^()\\]|\\[\s\S])*\)\s*\((?:[^()\\]|\\[\s\S])*\)[msixpodualngcer]*/,
			lookbehind: true,
			greedy: true
		},

		// s{...}{...}
		{
			pattern: /(^|[^-]\b)(?:s|tr|y)\s*\{(?:[^{}\\]|\\[\s\S])*\}\s*\{(?:[^{}\\]|\\[\s\S])*\}[msixpodualngcer]*/,
			lookbehind: true,
			greedy: true
		},

		// s[...][...]
		{
			pattern: /(^|[^-]\b)(?:s|tr|y)\s*\[(?:[^[\]\\]|\\[\s\S])*\]\s*\[(?:[^[\]\\]|\\[\s\S])*\][msixpodualngcer]*/,
			lookbehind: true,
			greedy: true
		},

		// s<...><...>
		{
			pattern: /(^|[^-]\b)(?:s|tr|y)\s*<(?:[^<>\\]|\\[\s\S])*>\s*<(?:[^<>\\]|\\[\s\S])*>[msixpodualngcer]*/,
			lookbehind: true,
			greedy: true
		},

		// /.../
		// The look-ahead tries to prevent two divisions on
		// the same line from being highlighted as regex.
		// This does not support multi-line regex.
		{
			pattern: /\/(?:[^\/\\\r\n]|\\.)*\/[msixpodualngc]*(?=\s*(?:$|[\r\n,.;})&|\-+*~<>!?^]|(?:lt|gt|le|ge|eq|ne|cmp|not|and|or|xor|x)\b))/,
			greedy: true
		}
	],

	// FIXME Not sure about the handling of ::, ', and #
	'variable': [
		// ${^POSTMATCH}
		/[&*$@%]\{\^[A-Z]+\}/,
		// $^V
		/[&*$@%]\^[A-Z_]/,
		// ${...}
		/[&*$@%]#?(?=\{)/,
		// $foo
		/[&*$@%]#?(?:(?:::)*'?(?!\d)[\w$]+)+(?:::)*/i,
		// $1
		/[&*$@%]\d+/,
		// $_, @_, %!
		// The negative lookahead prevents from breaking the %= operator
		/(?!%=)[$@%][!"#$%&'()*+,\-.\/:;<=>?@[\\\]^_`{|}~]/
	],
	'filehandle': {
		// <>, <FOO>, _
		pattern: /<(?![<=])\S*>|\b_\b/,
		alias: 'symbol'
	},
	'vstring': {
		// v1.2, 1.2.3
		pattern: /v\d+(?:\.\d+)*|\d+(?:\.\d+){2,}/,
		alias: 'string'
	},
	'function': {
		pattern: /sub [a-z0-9_]+/i,
		inside: {
			keyword: /sub/
		}
	},
	'keyword': /\b(?:any|break|continue|default|delete|die|do|else|elsif|eval|for|foreach|given|goto|if|last|local|my|next|our|package|print|redo|require|return|say|state|sub|switch|undef|unless|until|use|when|while)\b/,
	'number': /\b(?:0x[\dA-Fa-f](?:_?[\dA-Fa-f])*|0b[01](?:_?[01])*|(?:\d(?:_?\d)*)?\.?\d(?:_?\d)*(?:[Ee][+-]?\d+)?)\b/,
	'operator': /-[rwxoRWXOezsfdlpSbctugkTBMAC]\b|\+[+=]?|-[-=>]?|\*\*?=?|\/\/?=?|=[=~>]?|~[~=]?|\|\|?=?|&&?=?|<(?:=>?|<=?)?|>>?=?|![~=]?|[%^]=?|\.(?:=|\.\.?)?|[\\?]|\bx(?:=|\b)|\b(?:lt|gt|le|ge|eq|ne|cmp|not|and|or|xor)\b/,
	'punctuation': /[{}[\];(),:]/
};