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Are Python and JavaScript regular expression syntax identical?
If not, then:
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Python supports essentially the same regular expression syntax as Perl, as far as the regular expressions themselves. However, the syntax for using regular expressions is substantially different. Regular expression support is not available out of the box; you must import the re module.
Each different programming language will offer a function or method to run this validation. Often it's named something along the lines of matches and will return true if the pattern matches and false if not. This pattern is the same for all programming languages that implement Regular Expressions.
Regex is provided by many programming languages, such as python, java, javascript, etc.
A Regular Expression is used for identifying a search pattern in a text string. It also helps in finding out the correctness of the data and even operations such as finding, replacing and formatting the data is possible using Regular Expressions.
There is a comparison table here:
Regex Flavor Comparison
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Part 1
They are different; One difference is Python supports Unicode and Javascript doesn't.
Part 2
Read Mastering Regular Expressions. It gives information on how to identify the back-end engines (DFA vs NFA vs Hybrid) that a regex flavour uses. It gives tons of information on the different regex flavours out there.
There is way too much information to convey on a single SO answer, so you're better off having a solid piece of reference material on the subject.
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