How can I validate phone numbers with multiple formats (e.g., (123) 456-7890, 123-456-7890, and 1234567890) using JavaScript?

Validating Phone Numbers with Multiple Formats Using JavaScript

The given regular expression validates phone numbers in two formats: (123) 456-7890 and 123-456-7890. However, we can enhance its functionality to include the additional format of ten consecutive numbers, i.e., 1234567890.

To accomplish this, we modify the regular expression as follows:

/^[\+]?[0-9]{0,3}\W?+[(]?[0-9]{3}[)]?[-\s\.]?[0-9]{3}[-\s\.]?[0-9]{4,6}$/im

Let's break down the expression:

• ^: Start of the string
• [ ]?: Optional plus sign ( ) indicating an international number
• [0-9]{0,3}: Optional area code of up to three digits
• W?: Optional non-word character (whitespace, hyphen, or period)
• [(]?[0-9]{3}[)]?: Optional parentheses around the first three digits
• [-s.]?: Optional hyphen, whitespace, or period as the separator
• [0-9]{3}: The second set of three digits
• [-s.]?: Optional hyphen, whitespace, or period as the separator
• [0-9]{4,6}: The last set of four to six digits
• $: End of the string

This enhanced regular expression validates the following formats:

(123) 456-7890
(123)456-7890
123-456-7890
123.456.7890
1234567890
+31636363634
075-63546725
+1 (415)-555-1212
+1 (123) 456-7890
+1 (123)456-7890
+1 123-456-7890
+1 123.456.7890
+1 1234567890
+1 075-63546725
+12 (415)-555-1212
+12 (123) 456-7890
+12 (123)456-7890
+12 123-456-7890
+12 123.456.7890
+12 1234567890
+123 075-63546725
+123 (415)-555-1212
+123 (123) 456-7890
+123 (123)456-7890
+123 123-456-7890
+123 123.456.7890
+123 1234567890
+123 075-63546725
+1(415)-555-1212
+1(123) 456-7890
+1(123)456-7890
+1123-456-7890
+1123.456.7890
+11234567890
+1075-63546725
+12(415)-555-1212
+12(123) 456-7890
+12(123)456-7890
+12123-456-7890
+12123.456.7890
+121234567890
+123075-63546725
+123(415)-555-1212
+123(123) 456-7890
+123(123)456-7890
+123123-456-7890
+123123.456.7890
+1231234567890
+123075-63546725

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