PROPERTY:  RegExp::lastMatch

This property is the last matched characters. As this property is static, you always use RegExp.lastMatch. For example, the following code would search through the string "the fisherman's tale" for a match with the regular expression of two consonants, one or more vowels and two consonants. In this case it will match the 'sherm' of 'fisherman'.

Code:
rexp = /([^aeiou\s]){2}([aeiou])+([^aeiou\s]){2}/
rexp("the fisherman's tale")

Output:
sherm