Cool RegEx Examples
What is RegEx?
Regular expressions are useful in search and replace operations. The typical use case is to look for a sub-string that matches a pattern and replace it with something else.
Sometimes, learning how to write RegEx’es before you even need them can save you a lot of time.
Here are some cool RegEx examples I learned;
RegEx to find only empty lines
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^(?:[\t ]*(?:\r?\n|\r))+
RegEx to find lines longer than 10 chars
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[^\n]{10,}
RegEx to match IPv4 Address
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^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$
RegEx to export src part of HTML image tag
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^<\s*img[^>]+src\s*=\s*(["'])(.*?)\1[^>]*>$
… will be updated …