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2016.08.20
Using Liquid in Jekyll - Live with Demos
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Summary of the egrep metacharacters1:
| Metacharacter | Matches | |
|---|---|---|
. | dot | Matches any one character |
[. . .] | character class | Matches any one character listed |
[^. . .] | negated character class | Matches any one character not listed |
\char | escaped character | When char is a metacharacter, or the escaped combination is not otherwise special, matches the literal char |
? | question | One allowed, but it is optional |
* | star | Any number allowed, but all are optional |
+ | plus | At least one required; additional are optional |
| {min, max} | specified range† | Min required, max allowed |
^ | caret | Matches the position at the start of the line |
$ | dollar | Matches the position at the end of the line |
\< | word boundary† | Matches the position at the start of a word |
\> | word boundary† | Matches the position at the end of a word |
| | alternation | Matches either expression it separates |
(. . .) | parentheses | Limits scope of alternation, provides grouping for the quantifiers, and “captures” for backreferences |
\1, \2, ... | backreference† | Matches text previously matched within first, second, etc., set of parentheses |
†not supported by all versions of egrep
There’re three types of escaped items:
- The pairing of
\and a metacharacter is a metasequence to match the literal character (for example,\*matches a literal asterisk). - The pairing of
\and selected non-metacharacters becomes a metasequence with an implementation-defined meaning (for example,\<often means “start of word”). - The pairing of
\and any other character defaults to simply matching the charater literal (that is, the backslash is ignored).
Friedl, Jeffrey E. F. Mastering Regular Expressions. 3rd ed. Sebastapol, CA: O’Reilly, 2006. ↩
THE END
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Frank Lin
Hey, there! This is Frank Lin (@flinhong), one of the 1.41 billion . This 'inDev. Journal' site holds the exploration of my quirky thoughts and random adventures through life. Hope you enjoy reading and perusing my posts.
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