Java regex Pattern matches doesn't recognise "Escape +" -

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this question has answer here:

i trying pattern ^\\+[0-9]+ match +852(2)78911, seems

pattern.matches("^\\+[0-9]+", s)

is returning false. when tried in regexr working fine i.e. giving me match. not escaping correctly in java sense?

try regex instead: ^\\+[0-9\\(\\)]+$


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