These fundamental regex elements apply to all implemenations, and will solve most or your regex needs.
Tutorial Details:
Regular expressions are a programming language for describing patterns in strings. At the syntax level, it's important to understand which characters are metacharacters (have a special meaning), and which are literal characters (stand for themselves). At the symantic level, several basic concepts are important: character classes, quantifiers, boundaries, grouping, and alternation. These fundamental regex elements apply to all implemenations, and will solve most or your regex needs.
Metacharacters
The characters that have special meaning are called metacharacters. A preceding backslash ("\") turns a metachacter into a literal character. The set of metacharacters in character classes, ie between [ and ], is different.
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