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How to join several (javascript) regular expressions into a single one?
For example, given [/^abcd$/,/^abxy$/,/^abz$/] the output will be /^ab(cd|xy|z)$/.
Is it even computationally possible?
307
to combine two expressions or more, put every expression in brackets, and use: *?
*$ means - match, from beginning to end, any character that appears zero or more times. Basically, that means - match everything from start to end of the string. This regex pattern is not very useful. Let's take a regex pattern that may be a bit useful.
In Chain Builder, you can use regular expression (regex) operators to match characters in text strings, such as to define patterns for: Mapping transformation rules for a Data Prep connector pipeline. The File Utilities connector's Find, Find and replace, and Split file commands.
A regular expression consists of a pattern and optional flags: g , i , m , u , s , y . Without flags and special symbols (that we'll study later), the search by a regexp is the same as a substring search. The method str. match(regexp) looks for matches: all of them if there's g flag, otherwise, only the first one.
It is quite easy to make such a tool for simple cases. Just put each pattern into parentheses and join them with "|". So for your example set of patterns it becomes:
/(^abcd$)|(^abxy$)|(^abz$)/
On a second thought, parentheses might not be necessary, so this will do:
/^abcd$|^abxy$|^abz$/
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