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Regex in mule expressionlanguage

I would like to know the meaning of the regular expression used in mule expression language

I have a choice component that uses the following expression 

regex('^[\\w\\s]+=.*',payload['Created_Package']) != null

Could some one please explain the meaning of the above expression?

Solution

  • The regular expression first starts at the beginning of the string, hence the ^ anchor, then matches any character that is considered a word character (a-z, A-Z, 0-9, _) or whitespace (1 or more times) followed by matching an equal = sign. Finally matching any character except newline (0 or more times)

    Some valid matches would be:

    foo=bar
123=456
   =foo
foo=&^&#$$#[]&^#

    Some invalid matches would be:

    *#*=dfds
[foo]=bar
1.2.3=456

    A good tool that offers explanation of a regular expression, Explain Regular Expression