This one gets close to handling most valid email address examples using the specification from RFC 282 ISO standard __ It doesn'T handle everything but manages fairly well...

X3D Regular Expressions (regexes): MFBool X3D MFBool is a list of boolean values, separated by whitespace or comma values http://www.web3d.org/specifications/X3dRegularExpressions.html#MFBool

X3D SFBool X3D SFBool is a single-field boolean value. http://www.web3d.org/specifications/X3dRegularExpressions.html#SFBool

X3D SFBool X3D SFBool is a single-field boolean value. http://www.web3d.org/specifications/X3dRegularExpressions.html#SFBool

Extensions sourced from here#Suffixes_for_compressed_files),

X3D bboxSize Three-tuple floating-point values with optional scientific notation, bounded non-negative or else -1 -1 -1 sentinel value. Derived from SFVec3f http://www.web3d.org/specifications/X3dRegularExpressions.html#bboxSize

preg_replace( '', '%newline%', $string )

devtable.config id="CodPay"

Handles single letter usernames, initial / trailing / consecutive periods, max length of 30 letters.

check if the phone number is correct, updated to 2018. controlla che il cellulare sia corretto, aggiornata al 2018

Parse the Accept request HTTP header advertises which content types, expressed as MIME types, https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept

X3D bboxSize Three-tuple floating-point values with optional scientific notation, bounded non-negative or else -1 -1 -1 sentinel value. Derived from SFVec3f http://www.web3d.org/specifications/X3dRegularExpressions.html#bboxSize