Regular expressions (or regex) are mainly used to check the Format and syntax. In simple terms, regex is a string that is used to compare another string by using a specific syntax. Similar to many other languages, Apex also provides regex capabilities.
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Regular expressions/Regex functionality in Apex can be achieved in the same manner as in Java i.e. with the help of Pattern and Matcher classes. Apex supports the standard syntax for regular expression used in java. A pattern is compiled form of a regular expression which can be used by the matcher to verify the format of the string.
Below is the sample example to validate the ZIP code for US format –
In this example, we have created a method to validate the ZIP code and this can be reused multiple times.
But if one wants to use the regex only once, the same can be achieved in a single sentence as shown below –
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