Common positive expressions

Regular expressions common regular expressions php common regular expressions positive integers normal distribution function expressions regular expressions java regular expressions
 
 
"^ [A-Z] + $" // a string consisting of 26 uppercase letters
"^ [A-z] + $" // a string consisting of 26 lowercase letters
"^ [A-Za-z0-9] + $" // string consisting of digits and 26 letters
"^ \ W + $" // a string consisting of a number, 26 English letters, or underscores
"^ [\ W-] + (\\. [\ w-] +) * @ [\ w-] + (\\. [\ w-] +) + $ "// email address
"^ [A-zA-z] +: // (\ w + (-\ w + )*)(\\. (\ w + (-\ w + )*))*(\\? \ S *)? $ "// Url
"^ \ D + $" // non-negative integer (positive integer + 0)
"^ [0-9] * [1-9] [0-9] * $" // positive integer
"^ (-\ D +) | (0 +) $" // non-positive integer (negative integer + 0)
"^-[0-9] * [1-9] [0-9] * $" // negative integer

"^ (-([0-9] + \\. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] * \. [0-9] +) | ([0-9] * [1-9] [0-9] *) $ "// negative floating point number
"^ (-? \ D +) (\. \ d + )? $ "// Floating point number
"^ [A-Za-z] + $" // A string consisting of 26 English letters

 

"^ -? \ D + $ "// integer
"^ \ D + (\. \ d + )? $ "// Non-negative floating point number (positive floating point number + 0)
"^ ([0-9] + \\. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] * \. [0-9] +) | ([0-9] * [1-9] [0-9] *) $ "// positive floating point number
"^ (-\ D + (\. \ d + )?) | (0 + (\. 0 + )?)) $ "// Non-positive floating point number (negative floating point number + 0)