troubleshooting Question

JavaScript: validating phone number so it starts with pre-defined digits

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czechmate1976Flag for United Kingdom of Great Britain and Northern Ireland asked on
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using JavaScript (jQuery)  I 'd like to validate a phone number 9 - 11 digits long, of which the starting digits should be one of the following 01 , 02, 075, 077, 078, 079 and do it live, but somehow not sure where to start. Could anyone help please?

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