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10.2.2
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Regular Expressions

Regular expressions, commonly referred to as regex patterns, can be used to search for and replace sets of characters in a given string a files.

Summary of regular-expression constructs

Construct

Matches

Characters

The character x

The backslash character

\0n

The character with octal value 0n (0 <= n <= 7)

\0nn

The character with octal value 0nn (0 <= n <= 7)

\0mnn

The character with octal value 0mnn (0 <= m <= 3, 0 <= n <= 7)

\xhh

The character with hexadecimal value 0xhh

\uhhhh

The character with Unicode value hhhh

The tab character ( '\u0009')

The newline (line feed) character ( '\u000A')

The carriage-return character ( '\u000D')

The form-feed character ( '\u000C')

The alert (bell) character ( '\u0007')

The escape character ( '\u001B')

\cx

The control character corresponding to x

Character Classes

[abc]

a, b, or c (simple class)

[^abc]

Any character except a, b, or c (negation)

[a-zA-Z]

a through z or A through Z, inclusive (range)

[a-d[m-p]]

a through d, or m through p: [a-dm-p] (union)

[a-z&&[def]]

d, e, or f (intersection)

[a-z&&[^bc]]

a through z, except for b and c: [ad-z] (subtraction)

[a-z&&[^m-p]]

a through z, and not m through p: [a-lq-z](subtraction)

Predefined Character Classes

Any character (may or may not match line terminators)

A digit: [0-9]

A non-digit: [^0-9]

A whitespace character: [ \t\n\x0B\f\r]

A non-whitespace character: [^\s]

A word character: [a-zA-Z_0-9]

A non-word character: [^\w]

Boundary Catchers

The beginning of a line

The end of a line

A word boundary

A non-word boundary

The beginning of the input

The end of the previous match

The end of the input but for the final terminator, if any

The end of the input

Back References

Where n is the nth captured group

Quotation

Nothing, but quotes the following character

Nothing, but quotes all characters until \E

Nothing, but ends quoting started by \Q

Example

String
Search Pattern
Replace Pattern
New Value

abc.txt
(.*)\.txt
$1.csv
abc.csv

abc.txt
(.*)(.)\.(.*)
$1x.$3
abx.txt

abc.txt
(.*)\.(.*) $120150101.$2
$120150101.$2
abc20150101.txt

abc20150101.txt
(.*)\d{8}\.(.*)
$1.$2
abc.txt

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Table of Contents

User Guide

User Guide

Regular Expressions

Regular Expressions