How to do “contains string” test in Bash? In the world of big data there is presence of hundreds of unstructured data in form of message streams or even text files. Now, if one needs to get the most juice out of the data it becomes imperative for the developers to parse that string and get the essential information out of the unstructured data and make it as a structured one. Shell Programming and Scripting Heads up on using extended regular expressions. If you wanted to match letters, digits or spaces you could use: [ [ $x =~ [0-9a-zA-Z\ ] ]]. read -ra
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