Matcher example:

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//Matcher example
String regexStr = /gr.*/
String str = 'groovy'

Matcher matcher0 = (str =~ regexStr)
boolean result0 = (str ==~ regexStr)
assert matcher0.matches() == result0

Matcher matcher1 = (str =~ /$regexStr/)
boolean result1 = (str ==~ /$regexStr/)
assert matcher1.matches() == result1

Find example:

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def cool = /gr\w{4}/  // Start with gr followed by 4 characters.
Matcher matcher2 = ('groovy, java and grails rock!' =~ /$cool/)
assert 2 == matcher2.count
assert 2 == matcher2.size() // Groovy adds size() method.
assert 'groovy' == matcher2[0] // Array-like access to match results.
assert 'grails' == matcher2.getAt(1)