Use regular expressions to validate/format a string
This is an impressive collection (that I found somehere on the Net) of various functions to validate or format string in Javascript. The code is very compact.
DESCRIPTION: This file contains a library of validation functions
using javascript regular expressions. Library also contains functions that re-
format fields for display or for storage.
VALIDATION FUNCTIONS:
validateEmail - checks format of email address
validateUSPhone - checks format of US phone number
validateNumeric - checks for valid numeric value
validateInteger - checks for valid integer value
validateNotEmpty - checks for blank form field
validateUSZip - checks for valid US zip code
validateUSDate - checks for valid date in US format
validateValue - checks a string against supplied pattern
FORMAT FUNCTIONS:
rightTrim - removes trailing spaces from a string
leftTrim - removes leading spaces from a string
trimAll - removes leading and trailing spaces from a string
removeCurrency - removes currency formatting characters (), $
addCurrency - inserts currency formatting characters
removeCommas - removes comma separators from a number
addCommas - adds comma separators to a number
removeCharacters - removes characters from a string that match passed pattern
function validateEmail( strValue) {
/************************************************
DESCRIPTION: Validates that a string contains a
valid email pattern.
PARAMETERS:
strValue - String to be tested for validity
RETURNS:
True if valid, otherwise false.
REMARKS: Accounts for email with country appended
does not validate that email contains valid URL
type (.com, .gov, etc.) or valid country suffix.
*************************************************/
var objRegExp = /(^[a-z]([a-z_\.]*)@([a-z_\.]*)([.][a-z]{3})$)|(^[a-z]([a-z_\.]*)@([a-z_\.]*)(\.[a-z]{3})(\.[a-z]{2})*$)/i;
//check for valid email
return objRegExp.test(strValue);
}
function validateUSPhone( strValue ) {
/************************************************
DESCRIPTION: Validates that a string contains valid
US phone pattern.
Ex. (999) 999-9999 or (999)999-9999
PARAMETERS:
strValue - String to be tested for validity
RETURNS:
True if valid, otherwise false.
*************************************************/
var objRegExp = /^\([1-9]\d{2}\)\s?\d{3}\-\d{4}$/;
//check for valid us phone with or without space between
//area code
return objRegExp.test(strValue);
}
function validateNumeric( strValue ) {
/******************************************************************************
DESCRIPTION: Validates that a string contains only valid numbers.
PARAMETERS:
strValue - String to be tested for validity
RETURNS:
True if valid, otherwise false.
******************************************************************************/
var objRegExp = /(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)/;
//check for numeric characters
return objRegExp.test(strValue);
}
function validateInteger( strValue ) {
/************************************************
DESCRIPTION: Validates that a string contains only
valid integer number.
PARAMETERS:
strValue - String to be tested for validity
RETURNS:
True if valid, otherwise false.
******************************************************************************/
var objRegExp = /(^-?\d\d*$)/;
//check for integer characters
return objRegExp.test(strValue);
}
function validateNotEmpty( strValue ) {
/************************************************
DESCRIPTION: Validates that a string is not all
blank (whitespace) characters.
PARAMETERS:
strValue - String to be tested for validity
function validateUSZip( strValue ) {
/************************************************
DESCRIPTION: Validates that a string a United
States zip code in 5 digit format or zip+4
format. 99999 or 99999-9999
PARAMETERS:
strValue - String to be tested for validity
RETURNS:
True if valid, otherwise false.
*************************************************/
var objRegExp = /(^\d{5}$)|(^\d{5}-\d{4}$)/;
//check for valid US Zipcode
return objRegExp.test(strValue);
}
function validateUSDate( strValue ) {
/************************************************
DESCRIPTION: Validates that a string contains only
valid dates with 2 digit month, 2 digit day,
4 digit year. Date separator can be ., -, or /.
Uses combination of regular expressions and
string parsing to validate date.
Ex. mm/dd/yyyy or mm-dd-yyyy or mm.dd.yyyy
PARAMETERS:
strValue - String to be tested for validity
RETURNS:
True if valid, otherwise false.
REMARKS:
Avoids some of the limitations of the Date.parse()
method such as the date separator character.
*************************************************/
var objRegExp = /^\d{1,2}(\-|\/|\.)\d{1,2}\1\d{4}$/
//check to see if in correct format
if(!objRegExp.test(strValue))
return false; //doesn't match pattern, bad date
else{
var strSeparator = strValue.substring(2,3) //find date separator
var arrayDate = strValue.split(strSeparator); //split date into month, day, year
//create a lookup for months not equal to Feb.
var arrayLookup = { '01' : 31,'03' : 31, '04' : 30,'05' : 31,'06' : 30,'07' : 31,
'08' : 31,'09' : 30,'10' : 31,'11' : 30,'12' : 31}
var intDay = parseInt(arrayDate[1]);
//check if month value and day value agree
if(arrayLookup[arrayDate[0]] != null) {
if(intDay <= arrayLookup[arrayDate[0]] && intDay != 0)
return true; //found in lookup table, good date
}
//check for February
var intYear = parseInt(arrayDate[2]);
var intMonth = parseInt(arrayDate[0]);
if( ((intYear % 4 == 0 && intDay <= 29) || (intYear % 4 != 0 && intDay <=28)) && intDay !=0)
return true; //Feb. had valid number of days
}
return false; //any other values, bad date
}
function validateValue( strValue, strMatchPattern ) {
/************************************************
DESCRIPTION: Validates that a string a matches
a valid regular expression value.
PARAMETERS:
strValue - String to be tested for validity
strMatchPattern - String containing a valid
regular expression match pattern.
RETURNS:
True if valid, otherwise false.
*************************************************/
var objRegExp = new RegExp( strMatchPattern);
//check if string matches pattern
return objRegExp.test(strValue);
}
function addCurrency( strValue ) {
/************************************************
DESCRIPTION: Formats a number as currency.
PARAMETERS:
strValue - Source string to be formatted
REMARKS: Assumes number passed is a valid
numeric value in the rounded to 2 decimal
places. If not, returns original value.
*************************************************/
var objRegExp = /-?[0-9]+\.[0-9]{2}$/;
RETURNS: String modified with comma grouping if
source was all numeric, otherwise source is
returned.
REMARKS: Used with integers or numbers with
2 or less decimal places.
*************************************************/
var objRegExp = new RegExp('(-?[0-9]+)([0-9]{3})');
//check for match to search criteria
while(objRegExp.test(strValue)) {
//replace original string with first group match,
//a comma, then second group match
strValue = strValue.replace(objRegExp, '$1,$2');
}
return strValue;
}
function removeCharacters( strValue, strMatchPattern ) {
/************************************************
DESCRIPTION: Removes characters from a source string
based upon matches of the supplied pattern.