valida el formato del registro federal de contribuyentes de México.

The string '{}' is valid while '{{}' is invalid as well as '}{'. Now, is this one valid: '{{{{v{a{l{{i{d or }i}}}n}v}}al}i}d?' ?

Match all certificate in a chain from a OpenSSL s_client output. Need for this come from a script that should be able to verify the root CA of a URL.

sim regex

Grupo Autores

as

Alow alphanumeric characters and spaces

match bibtex entries

Replaces all occurrences of AssertTrue(a == b); in a file with AssertEquals(a,b), which allows for more information in the test.

http://haacked.com/archive/2004/10/25/usingregularexpressionstomatchhtml.aspx/

This regex defines the end and the beginning of a WindowsUpdate.log event.

U.S. Phone number with optional area code.