Or we can add a case insensitive flag i behind the entire expression, which will match all words containing vowels regardless of their case. The triangular Reference List button next to the Find what field then becomes available. The domain name should be between 1 and 63 characters long. The valid domain name must satisfy the following conditions: The domain name should be a-z or A-Z or 09 and hyphen (-). If you do, it will match any non- NULL value at all. To enable the use of regular expressions in the Find what field during QuickFind, FindinFiles, Quick Replace, or Replace in Files operations, select the Use option under Find Options and choose Regular expressions. Given string str, the task is to check whether the given string is a valid domain name or not by using Regular Expression. To include uppercase letter into the mix, we can either add uppercase letter ranges into both letter character ranges: / * * / The fact that a regular expression matches a string if the pattern is found anywhere in the string means you must take care not to inadvertently specify a pattern that matches the empty string. The expression above will only match one other letter before and after each vowel, so we can include a zero-or-more quantifier * behind each of the character ranges to match zero or more letters: / * * / To match any word that contains a vowel, we can include a character range of all letters before and after the vowel character set. To match double vowels like ae or oo we need to include a quantifier behind the square brackets to indicate how many vowels we would like to match.
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