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we would like to bring support for contains operator in cps-path. 

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_ : Matches any single character.

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{
 "lang": "en", 
 "price": 699, 
 "title": "The Golden Compass", 
 "authors": [
           "Philip Pullman"
 ], 
"pub_year":1995
}                                                                                                
{
 "lang": "english", 
 "price": 895, 
 "title": "Feersum Endjinn", 
 "authors": [
            "Iain M. Banks"
 ], 
"pub_year":1994
}    

{
 "lang": "en", 
 "price": 699, 
 "title": "The Golden Compass", 
 "authors": [
           "Philip Pullman"
 ], 
"pub_year":1995
}                                                                                                
{
 "lang": "English", 
 "price": 895, 
 "title": "Feersum Endjinn", 
 "authors": [
            "Iain M. Banks"
 ], 
"pub_year":1994
}              

{
 "lang": "en", 
 "price": 699, 
 "title": "The Golden Compass", 
 "authors": [
           "Philip Pullman"
 ], 
"pub_year":1995
}           

2.Using SIMILAR TO Regular Expression Keyword :

The only difference between like and similar to is to pattern matches the given string. It is similar to LIKE, except that it interprets the pattern using the SQL standard's definition of a regular expression

SIMILAR TO supports these pattern-matching metacharacters borrowed from POSIX regular expressions:

• | denotes alternation (either of two alternatives).

• * denotes repetition of the previous item zero or more times.

• + denotes repetition of the previous item one or more times.

• ? denotes repetition of the previous item zero or one time.

• {m} denotes repetition of the previous item exactly m times.

• {m,} denotes repetition of the previous item m or more times.

• {m,n} denotes repetition of the previous item at least m and not more than n times.

• Parentheses () can be used to group items into a single logical item.

• A bracket expression [...] specifies a character class, just as in POSIX regular expressions.

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