Regular expression security

Pass the Test


Regular expressions are useful for checking user input and are deployed in web applications and on firewalls or proxy servers. However, they also have pitfalls that are not immediately obvious. For this reason, you should always test the regular expressions you use intensively, because the damage potential is not always apparent. If you have inadvertently developed a vulnerable regular expression, sometimes simple adjustments or tolerable inaccuracy in the recognition process can make a broken or unsafe regular expression work safely.

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