Table of Contents for

Regular Expressions Cookbook, 2nd Edition

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last names, formatting, Problem–See Also, JavaScript example–JavaScript example, List surname particles at the beginning of the name–List surname particles at the beginning of the name

in JavaScript, JavaScript example–JavaScript example

listing surname particles at beginning of name, List surname particles at the beginning of the name–List surname particles at the beginning of the name

lastIndex property (JavaScript), JavaScript, JavaScript, JavaScript, JavaScript, JavaScript, JavaScript, JavaScript, JavaScript, JavaScript, JavaScript, JavaScript, JavaScript, JavaScript

lazy quantifiers, Problem–See Also, Discussion, Variations–Variations

lazy, defined, Discussion

leading whitespace, trimming, Problem–See Also

leftmost, defined, Discussion

length of text, Problem–See Also, Perl example–Perl example, Limit the length of an arbitrary pattern–Limit the length of an arbitrary pattern, Limit the number of nonwhitespace characters–Limit the number of nonwhitespace characters, Limit the number of words–Limit the number of words

limiting, Problem–See Also, Perl example–Perl example, Limit the length of an arbitrary pattern–Limit the length of an arbitrary pattern, Limit the number of nonwhitespace characters–Limit the number of nonwhitespace characters, Limit the number of words–Limit the number of words

for arbitrary pattern, Limit the length of an arbitrary pattern–Limit the length of an arbitrary pattern

in Perl, Perl example–Perl example

number of words, Limit the number of words–Limit the number of words

using lookahead, Limit the number of nonwhitespace characters–Limit the number of nonwhitespace characters

Length property (.NET), .NET, .NET, .NET, .NET, .NET, .NET

length property (JavaScript), JavaScript, JavaScript, Solution

length() method (Ruby), Ruby

Letter category, Problem

Levithan, Steven, Regex Flavors Covered by This Book, RegexBuddy, RegexPal, Languages Covered in This Chapter, JavaScript

Library panel, RegexBuddy, RegexBuddy

line breaks, Problem–Any character except line breaks, Problem–Any character including line breaks, Step 2: Replace all line breaks with <br>–Step 2: Replace all line breaks with <br>, Step 3: Replace double <br> tags with </p><p>–Step 3: Replace double <br> tags with </p><p>, Step 2: Replace all line breaks with <br>–Step 2: Replace all line breaks with <br>, Step 3: Replace double <br> tags with </p><p>–Step 3: Replace double <br> tags with </p><p>

converting plain text to HTML tags, Step 2: Replace all line breaks with <br>–Step 2: Replace all line breaks with <br>, Step 3: Replace double <br> tags with </p><p>–Step 3: Replace double <br> tags with </p><p>, Step 2: Replace all line breaks with <br>–Step 2: Replace all line breaks with <br>, Step 3: Replace double <br> tags with </p><p>–Step 3: Replace double <br> tags with </p><p>

matching any character except, Problem–Any character except line breaks

matching any character including, Problem–Any character including line breaks

line feed (newline), Discussion

lines, C#–Ruby, Problem–See Also, PHP (PCRE) example–PHP (PCRE) example, Working with esoteric line separators–Working with esoteric line separators, Problem–See Also, Option 1: Sort lines and remove adjacent duplicates–Option 1: Sort lines and remove adjacent duplicates, Option 2: Keep the last occurrence of each duplicate line in an unsorted file–Option 2: Keep the last occurrence of each duplicate line in an unsorted file, Option 3: Keep the first occurrence of each duplicate line in an unsorted file–Option 3: Keep the first occurrence of each duplicate line in an unsorted file, Option 2: Keep the last occurrence of each duplicate line in an unsorted file–Option 2: Keep the last occurrence of each duplicate line in an unsorted file, Problem–See Also, Problem–See Also

finding that contain word, Problem–See Also

finding that do not contain word, Problem–See Also

limiting, Problem–See Also, PHP (PCRE) example–PHP (PCRE) example, Working with esoteric line separators–Working with esoteric line separators

in PHP, PHP (PCRE) example–PHP (PCRE) example

with esoteric line separators, Working with esoteric line separators–Working with esoteric line separators

parsing by, C#–Ruby

removing duplicate, Problem–See Also, Option 1: Sort lines and remove adjacent duplicates–Option 1: Sort lines and remove adjacent duplicates, Option 2: Keep the last occurrence of each duplicate line in an unsorted file–Option 2: Keep the last occurrence of each duplicate line in an unsorted file, Option 3: Keep the first occurrence of each duplicate line in an unsorted file–Option 3: Keep the first occurrence of each duplicate line in an unsorted file, Option 2: Keep the last occurrence of each duplicate line in an unsorted file–Option 2: Keep the last occurrence of each duplicate line in an unsorted file

keeping first occurrence in unsorted file, Option 3: Keep the first occurrence of each duplicate line in an unsorted file–Option 3: Keep the first occurrence of each duplicate line in an unsorted file

keeping last occurrence in unsorted file, Option 2: Keep the last occurrence of each duplicate line in an unsorted file–Option 2: Keep the last occurrence of each duplicate line in an unsorted file, Option 2: Keep the last occurrence of each duplicate line in an unsorted file–Option 2: Keep the last occurrence of each duplicate line in an unsorted file

sorting and removing adjacent duplicates, Option 1: Sort lines and remove adjacent duplicates–Option 1: Sort lines and remove adjacent duplicates

links, creating from URLs, Problem–See Also

literal text, Problem–See Also, Block escape–Block escape, Case-insensitive matching–Case-insensitive matching, Discussion

including backslashes as, Discussion

matching, Problem–See Also, Block escape–Block escape, Case-insensitive matching–Case-insensitive matching

block escape in, Block escape–Block escape

case-insensitive matching, Case-insensitive matching–Case-insensitive matching

log files, Problem–See Also, Problem–See Also, Problem–See Also

broken links reported in web logs, Problem–See Also

Combined Log Format, Problem–See Also

Common Log Format, Problem–See Also

lookaheads, Word boundaries, Word boundaries, Word boundaries, Lookaround, Limit the length of an arbitrary pattern, Limit the number of nonwhitespace characters–Limit the number of nonwhitespace characters, Validate multiple password rules with a single regex–Validate multiple password rules with a single regex, Discussion, Discussion–Discussion, Variations, Option 2: Keep the last occurrence of each duplicate line in an unsorted file–Option 3: Keep the first occurrence of each duplicate line in an unsorted file, Discussion–Discussion, Discussion, Discussion, Discussion, Compressed notation

(see also lookarounds)

(see also lookbehinds)

and ^ token, Limit the length of an arbitrary pattern

defined, Lookaround

limiting length of text using, Limit the number of nonwhitespace characters–Limit the number of nonwhitespace characters

matching same text twice using, Discussion, Discussion

negative, Discussion–Discussion, Discussion–Discussion

using to solve math limitations, Compressed notation

using with international text, Discussion

using word boundaries if not available, Discussion

lookarounds, Problem, Problem, Problem–See Also, Lookaround–Lookaround, Lookaround, Negative lookaround–Negative lookaround, Matching the same text twice–Matching the same text twice, Lookaround is atomic–Lookaround is atomic, Alternative to Lookbehind–Alternative to Lookbehind, Solution Without Lookbehind–Solution Without Lookbehind, Discussion

(see also lookaheads)

(see also lookbehinds)

alternative to lookbehind, Alternative to Lookbehind–Alternative to Lookbehind

are atomic, Lookaround is atomic–Lookaround is atomic

defined, Lookaround

matching same text twice using, Matching the same text twice–Matching the same text twice

negative, Negative lookaround–Negative lookaround

overview, Lookaround–Lookaround

solution without, Solution Without Lookbehind–Solution Without Lookbehind

using word boundaries if not available, Discussion

lookbehinds, Word boundaries, Word boundaries, Word boundaries, Lookaround, Different levels of lookbehind–Different levels of lookbehind, Alternative to Lookbehind–Alternative to Lookbehind, Discussion, Lookbehind you–Simulate lookbehind, Lookbehind you–Fixed, finite, and infinite length lookbehind, Simulate lookbehind–Simulate lookbehind, Fixed, finite, and infinite length lookbehind, Variations, Match separator positions only, using lookbehind–Search-and-replace within matched numbers, Use infinite lookbehind–Use infinite lookbehind, Use infinite lookbehind, Discussion–Discussion, Standard notation, Discussion

(see also lookaheads)

(see also lookarounds)

+ quantifier in, Use infinite lookbehind

adding thousand separators to numbers using, Match separator positions only, using lookbehind–Search-and-replace within matched numbers

alternative to, Alternative to Lookbehind–Alternative to Lookbehind

defined, Lookaround

finding any word not preceded by specific using, Lookbehind you–Fixed, finite, and infinite length lookbehind

infinite and finite repetition in, Discussion–Discussion

infinite lookbehind, Use infinite lookbehind–Use infinite lookbehind

levels of, Different levels of lookbehind–Different levels of lookbehind

simulating, Simulate lookbehind–Simulate lookbehind

support for, Standard notation

using with international text, Discussion

using word boundaries if not available, Discussion

\b token in, Fixed, finite, and infinite length lookbehind

Lovitt, Michael, Rubular

lowercase letters and password complexity, One or more lowercase letters–One or more lowercase letters

Luhn algorithm, Extra Validation with the Luhn Algorithm–Extra Validation with the Luhn Algorithm