Basic Examples (4) 

Parse an integer:

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Parse a real number:

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Parse a negative number:

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$Failed will be returned if the string could not be parsed safely:

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Scope (1) 

NumberParse threads automatically over lists:

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Options (6) 

AllowPrecision (2) 

Arbitrary-precision numbers cannot be parsed with default settings:

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Enable parsing of arbitrary-precision numbers:

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AllowScientificNotation (2) 

Numbers specified in scientific notation do not parse by default:

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Enable parsing of numbers specified in scientific notation:

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AllowNonDecimal (2) 

Numbers specified in bases other than 10 do not parse by default:

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Enable parsing of non-decimal numbers:

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Properties and Relations (3) 

ToExpression can also be used to parse numbers, but is dangerous to use with unfiltered input:

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NumberParse filters its input, evaluating only numeric content judged to be safe:

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FromDigits can also be used to safely parse numbers, but it only supports non-negative integers:

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NumberParse supports real and negative numbers:

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Interpreter["Number"] can also be used to safely parse numbers, but its performance can be unpredictable. By contrast, NumberParse has relatively stable, reasonably fast performance:

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Possible Issues (1) 

NumberParse does not support complex or rational numbers:

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