check if the format is HH:MM (00:00 is OK, 0:00 is not)

http://stackoverflow.com/questions/2362985/verifying-a-cron-expression-is-valid-in-java

Let's say a phone number is valid in case it has 11 digits only (13 in case of using 00 instead of +). Separators could be anywhere. Take the valid numbers and bring to common format. Original idea was deleting all non-digits but using look-ahead made impossible to use + for remove non-digits, it ne...

Regex to match R-G-B and Opacity with/without "," and even RGBA text It will match rgba(x,x,x,x.x) rgba (x x X x.x) x,x,x,x.x x x x x.x...

Let's say a phone number is valid in case it has 11 digits (or 13 in case we use 00 instead of + ). Take those lines to common format. original idea was to remove all non-digit characters from those lines with simple match like but combined with look-ahead it just did not work, had to go through ea...

insert into table ( a, b, c ) values ( " insert into values (1,2,3)",1,2.3,"a,b" ); insert into table (ee,bb,cc) values (aa,234,"asj",2.3);

insert into (a,b,c) values (1,2.3,"test");

insert[\s]+into[\s]+\([\s](?.?)[\s]\)[\s]+values[\s]+\((?.?)[\s]*\);

Based on http://www.regular-expressions.info/creditcard.html This example includes test strings. This only validates the pattern, and not whether the credit card number passes a checksum validation. See the Luhn algorithm for details https://en.wikipedia.org/wiki/Luhn_algorithm...

regexp for year filtering

Besides leap year handling, this takes care of date validation in the yy-mm-dd format.