In a regular expression, square brackets are used to indicate character classes, which matches any of the characters in the character set.| www.regular-expressions.info
Understanding how a regex engine works internally enables you to craft better regular expressions by learning how to think like a regex engine.| www.regular-expressions.info
In a regular expression, the vertical bar or pipe symbol tells the regex engine to match any of two or more options| www.regular-expressions.info
Learn how to use regular expressions with Tcl’s regexp and regsub commands| www.regular-expressions.info
Explains the two regex flavors defined in the POSIX standard: Basic Regular Expressions and Extended Regular Expressions| www.regular-expressions.info
If you have written regular expressions before, you know that the regex syntax can be hard to keep track of. Certainly when writing a regex pattern that uses plenty of grouping and alternation.| www.regexbuddy.com
In regular expressions, \b anchors the regex at a word boundary or the position between a word and a non-word character, or vice versa.| www.regular-expressions.info