REGEX

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Grep
- Metacharacters *
- Classes *
- Negated Classes *
- Any Character *
- Alternation *
- Word Boundaries *
- Optional *
- Quantifiers *
- Backreference *

Perl
- Non Capturing *
- Shorthands * ♣
- Substitution *
- Lookaround *
- Delimiters *
- Context *
- Mode Modifier *
- Atomic Grouping *
- Mechanics *

Perl ♣ Shorthands

Shorthand for any whitespace character \s
Matches a backspace \b

$s = '-98 F'
$p = '^([-+]?[0-9]+)\s*[CF]$'

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