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Anchors

Anchors are an aspect of a regular expression which specifies a position in a string where a match must occur. An anchor that is used in a regular expression will not advance through the string or consume characters. Instead, it looks for a match in the specified position only. For example, ^ specifies that the match must start at the beginning of a line or string. Common anchors include:


^ Start of a line
\A Start of an input string
$ End of a line
\Z End of an input string

Additional Resources

Anchors (Off-site)
Regular Expressions Main Page

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