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Regular expression for validating numbers

Decimals are numerics so you don't need to check for decimals specifically. To allow numbers with an optional decimal point followed by digits.

A digit in the range 1-9 followed by zero or more other digits then optionally followed by a decimal point followed by at least 1 digit: i.e.

Regular expressions are used in search engines, search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK and in lexical analysis.

Many programming languages provide regex capabilities, built-in, or via libraries.

For example, in the regex a is a literal character which matches just 'a' and .

is, in theoretical computer science and formal language theory, a sequence of characters that define a search pattern.I think that the assumption that every website must accommodate every possible name is fallacious. Are you trying to craft a regular expression for an input to validate it is a numeric value?this is a digit in the range 1-9 followed by up to 2 other digits then zero or more groups of a full stop followed by 3 digits then optionally your comma and digits as before. anywhere between the digits then try: sorry mike but not worked.I'm sorry my English skills but I'll try to explain my question.You can find many pre-made expressions out there, which can be very useful to you.Here is an example where we require a 4 digit number - nothing else is acceptable: The only new attribute we use, is the validationexpression. =.*[A-Z]) # must contains one uppercase characters (? =.*[a-z]) # must contains one lowercase characters (?The phrase regular expressions (and consequently, regexes) is often used to mean the specific, standard textual syntax (distinct from the mathematical notation described below) for representing patterns that matching text need to conform to.Each character in a regular expression (that is, each character in the string describing its pattern) is understood to be a metacharacter (with its special meaning), or a regular character (with its literal meaning).

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