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Quantifiers 

Quantifiers add optional quantity data to a regular expression. A quantifier expression applies to the character, group, or character class that immediately precedes it. The .NET Framework regular expressions support minimal matching ("lazy") quantifiers.

The following table describes the metacharacters that affect matching. The quantities n and m are integer constants.

Quantifier Description

*

Specifies zero or more matches; for example, \w* or (abc)*. Equivalent to {0,}.

+

Specifies one or more matches; for example, \w+ or (abc)+. Equivalent to {1,}.

?

Specifies zero or one matches; for example, \w? or (abc)?. Equivalent to {0,1}.

{n}

Specifies exactly n matches; for example, (pizza){2}.

{n,}

Specifies at least n matches; for example, (abc){2,}.

{n,m}

Specifies at least n, but no more than m, matches.

*?

Specifies the first match that consumes as few repeats as possible (equivalent to lazy *).

+?

Specifies as few repeats as possible, but at least one (equivalent to lazy +).

??

Specifies zero repeats if possible, or one (lazy ?).

{n}?

Equivalent to {n} (lazy {n}).

{n,}?

Specifies as few repeats as possible, but at least n (lazy {n,}).

{n,m}?

Specifies as few repeats as possible between n and m (lazy {n,m}).

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