wso2 CEP in-built function - isMatch -

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i trying use cep 3.1.0 built in function regexp matching 

 cseeventstream[ismatch('foo\sbar',symbol)]

which should match "foo bar" , not "foobar". however, fails error mesage

mismatched character '\' expecting '''

i have tried escaping multiple '\'. also, [ismatch('foo bar',symbol)] not work. although, cseeventstream[symbol contains 'foo\sbar'] temporary workaround, inability use '\' severe limitation in regexp matching.

well it's looking '\' character. in ismatch documentation? says expecting ' maybe have use '\ ??


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