UNIX has a "-E" switch to allow its grep utility to match multiple patterns at once, eg:
grep -E "abc|def|ghi|jkl" infile
will match all lines in infile which contain "abc" or "def", etc.
I know Perl has a "grep" command, and I know it can also do pattern matching with the "=~" operator, but how can I write CONCISE Perl code to match multiple patterns with the:
1. grep command?
2. "=~" operator?
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On Microsoft Windows, if when you click or type the name of a .pl file, you get an error "is not recognized as an internal or external command, operable program or batch file", then this means you do not have the .pl file extension associated with …
I have been pestered over the years to produce and distribute regular data extracts, and often the request have explicitly requested the data be emailed as an Excel attachement; specifically Excel, as it appears: CSV files confuse (no Red or Green h…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: