November 2017
Intermediate to advanced
342 pages
9h 9m
English
Content preview from Mastering MongoDB 3.x
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Expression string operators
Similar to date operators, string operators are used when we want to transform our data from one stage of the pipeline to the next one. Potential use cases include pre-processing text fields to extract relevant information to be used in later stages of our pipeline.
- $concat: This is used to concatenate strings.
- $split: This is used to split strings based on delimiter. If the delimiter is not found, the original string is returned.
- $strcasecmp: This is used in case-insensitive string comparison; 0 if strings are equal, 1 if the first string is great, otherwise -1.
- $toLower / $toUpper: This is used to convert string to all lowercase or all uppercase respectively.
- $indexOfBytes: This is used to return the Byte occurrence ...
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