Regex that can only contain alphanumeric characters and underscores, but the first character must be alphabetical (single character failure)
1388
Learning Regular Expressions
101144
How to match, but not capture, part of a regex?
148446
allowing only alphabets in text box using java script
149804
How can I match a quote-delimited string with a regex?
70885
Regex for quoted string with escaping quotes
106452
Apex: Is there a way to strip out non-alphanumeric characters from a string?
70340
Regular expression to skip character in capture group
132593
Regular expression for upper case letter only in JavaScript
124636
RegEx for allowing alphanumeric at the starting and hyphen thereafter
116844
Regex Help- Escaping Characters And Matcher Method
759
How do I match any character across multiple lines in a regular expression?
2223
Regular expression to match 7-12 digits; may contain space or hyphen
121124
regex to match word boundary beginning with special characters
1805
Do Python regexes support something like Perl's \G?
144793
Allow only alphanumeric characters for a UITextField
2559
Is there a regular expression to detect a valid regular expression?
68475
Regex to remove letters, symbols except numbers