Two types of regular expression tests are demonstrated here: 'test(value)' and 'exec(value)'.
To check for an exact match, use 'test'.
To see if there is any match in the input string and return the portion that matches the expression, use 'exec'.

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RegEx Test RegEx Exec

Only format 'a1b 2c3' and 'a1b2c3' are allowed. (Not case sensitive)