Hi , regular expression is a text matching mechanism . suppose you want to validate whether given input to textbox is mobile number or not? , then regular expression is good way.
To validate mobile like(+9548508412 or 9548508412 or 95485084121 ) , means if you want that mobile number should be at least 10 digit long and '+' is optional , you can use these regular expression :
\+?\d{10,}
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