How Can I Validate Ten-Digit Phone Numbers and Other Formats Using JavaScript Regular Expressions?

Validate Phone Numbers with JavaScript, Including the Ten-Digit Format

Introduction:

Validating phone numbers is crucial to ensure that user input is in the correct format for various applications. This article addresses the need to enhance an existing regular expression to validate phone numbers in a specific format, such as ten digits without any special characters.

Problem:

A developer encountered a scenario where they needed to validate phone numbers in three formats:

1. (123) 456-7890
2. 123-456-7890
3. 1234567890

The existing regular expression (/^(()?d{3}())?(-|s)?d{3}(-|s)d{4}$/) only catered to the first two formats.

Solution:

To address this issue, we can modify the regular expression to include the ten-digit format:

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

Explanation:

• ^[ ]?: Optional leading plus sign for international numbers
• [0-9]{0,3}: Optional country code (0 to 3 digits)
• W? : Optional non-word character (e.g., space, dash, or dot)
• [(]?[0-9]{3}[)]?: Optional parentheses around the area code
• [-s.]?: Optional dash, space, or dot as a separator
• [0-9]{3}: Three-digit exchange code
• [-s.]?: Optional separator
• [0-9]{4,6}: Four to six digits for the phone number

Validation Examples:

The enhanced regular expression validates all the given formats, including:

• (123) 456-7890
• 123-456-7890
• 1234567890

Additional Formats:

The regular expression also supports the following additional formats:

• International numbers with country code
• Numbers with spaces, dashes, or dots as separators
• Ten-digit numbers without any special characters

By incorporating this enhanced regular expression, the validation of phone numbers in the given formats can be achieved effectively.

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