What is an OR in RegEx?
Alternation is the term in regular expression that is actually a simple “OR”. In a regular expression it is denoted with a vertical line character | . Alternation allows any expressions. A regexp A|B|C means one of expressions A , B or C .
Can we use or in RegEx?
“Or” in regular expressions `||` Fortunately the grouping and alternation facilities provided by the regex engine are very capable, but when all else fails we can just perform a second match using a separate regular expression – supported by the tool or native language of your choice.
Can I use RegEx in if statement Javascript?
The RegEx variable can just then be combined with the test( ) method to check the string. As the result is just a returned boolean (true or false), it can be easily combined with an if/else statement or ternary operator to continue with further actions depending on whether the string is present or not.
How do you write an OR statement in regex?
You can use the | operator (logical OR) to match characters or expression of either the left or right of the | operator. For example the (t|T) will match either t or T from the input string.
What is regular expression in JavaScript?
Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects. These patterns are used with the exec() and test() methods of RegExp , and with the match() , matchAll() , replace() , replaceAll() , search() , and split() methods of String .
How do you write if in a regular expression?
If the if part evaluates to true, then the regex engine will attempt to match the then part. Otherwise, the else part is attempted instead. The syntax consists of a pair of parentheses. The opening bracket must be followed by a question mark, immediately followed by the if part, immediately followed by the then part.