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constant PREG_CLASS_UNICODE_WORD_BOUNDARY in Drupal 7

Matches Unicode characters that are word boundaries.

Characters with the following General_category (gc) property values are used as word boundaries. While this does not fully conform to the Word Boundaries algorithm described in http://unicode.org/reports/tr29, as PCRE does not contain the Word_Break property table, this simpler algorithm has to do.

  • Cc, Cf, Cn, Co, Cs: Other.
  • Pc, Pd, Pe, Pf, Pi, Po, Ps: Punctuation.
  • Sc, Sk, Sm, So: Symbols.
  • Zl, Zp, Zs: Separators.

Non-boundary characters include the following General_category (gc) property values:

  • Ll, Lm, Lo, Lt, Lu: Letters.
  • Mc, Me, Mn: Combining Marks.
  • Nd, Nl, No: Numbers.

Note that the PCRE property matcher is not used because we wanted to be compatible with Unicode 5.2.0 regardless of the PCRE version used (and any bugs in PCRE property tables).

See also

http://unicode.org/glossary

3 uses of PREG_CLASS_UNICODE_WORD_BOUNDARY
search_excerpt in modules/search/search.module
Returns snippets from a piece of text, with certain keywords highlighted. Used for formatting search results.
search_simplify in modules/search/search.module
Simplifies a string according to indexing rules.
truncate_utf8 in includes/unicode.inc
Truncates a UTF-8-encoded string safely to a number of characters.

File

includes/unicode.inc, line 48
Provides Unicode-related conversions and operations.

Code

define('PREG_CLASS_UNICODE_WORD_BOUNDARY', '\\x{0}-\\x{2F}\\x{3A}-\\x{40}\\x{5B}-\\x{60}\\x{7B}-\\x{A9}\\x{AB}-\\x{B1}\\x{B4}' . '\\x{B6}-\\x{B8}\\x{BB}\\x{BF}\\x{D7}\\x{F7}\\x{2C2}-\\x{2C5}\\x{2D2}-\\x{2DF}' . '\\x{2E5}-\\x{2EB}\\x{2ED}\\x{2EF}-\\x{2FF}\\x{375}\\x{37E}-\\x{385}\\x{387}\\x{3F6}' . '\\x{482}\\x{55A}-\\x{55F}\\x{589}-\\x{58A}\\x{5BE}\\x{5C0}\\x{5C3}\\x{5C6}' . '\\x{5F3}-\\x{60F}\\x{61B}-\\x{61F}\\x{66A}-\\x{66D}\\x{6D4}\\x{6DD}\\x{6E9}' . '\\x{6FD}-\\x{6FE}\\x{700}-\\x{70F}\\x{7F6}-\\x{7F9}\\x{830}-\\x{83E}' . '\\x{964}-\\x{965}\\x{970}\\x{9F2}-\\x{9F3}\\x{9FA}-\\x{9FB}\\x{AF1}\\x{B70}' . '\\x{BF3}-\\x{BFA}\\x{C7F}\\x{CF1}-\\x{CF2}\\x{D79}\\x{DF4}\\x{E3F}\\x{E4F}' . '\\x{E5A}-\\x{E5B}\\x{F01}-\\x{F17}\\x{F1A}-\\x{F1F}\\x{F34}\\x{F36}\\x{F38}' . '\\x{F3A}-\\x{F3D}\\x{F85}\\x{FBE}-\\x{FC5}\\x{FC7}-\\x{FD8}\\x{104A}-\\x{104F}' . '\\x{109E}-\\x{109F}\\x{10FB}\\x{1360}-\\x{1368}\\x{1390}-\\x{1399}\\x{1400}' . '\\x{166D}-\\x{166E}\\x{1680}\\x{169B}-\\x{169C}\\x{16EB}-\\x{16ED}' . '\\x{1735}-\\x{1736}\\x{17B4}-\\x{17B5}\\x{17D4}-\\x{17D6}\\x{17D8}-\\x{17DB}' . '\\x{1800}-\\x{180A}\\x{180E}\\x{1940}-\\x{1945}\\x{19DE}-\\x{19FF}' . '\\x{1A1E}-\\x{1A1F}\\x{1AA0}-\\x{1AA6}\\x{1AA8}-\\x{1AAD}\\x{1B5A}-\\x{1B6A}' . '\\x{1B74}-\\x{1B7C}\\x{1C3B}-\\x{1C3F}\\x{1C7E}-\\x{1C7F}\\x{1CD3}\\x{1FBD}' . '\\x{1FBF}-\\x{1FC1}\\x{1FCD}-\\x{1FCF}\\x{1FDD}-\\x{1FDF}\\x{1FED}-\\x{1FEF}' . '\\x{1FFD}-\\x{206F}\\x{207A}-\\x{207E}\\x{208A}-\\x{208E}\\x{20A0}-\\x{20B8}' . '\\x{2100}-\\x{2101}\\x{2103}-\\x{2106}\\x{2108}-\\x{2109}\\x{2114}' . '\\x{2116}-\\x{2118}\\x{211E}-\\x{2123}\\x{2125}\\x{2127}\\x{2129}\\x{212E}' . '\\x{213A}-\\x{213B}\\x{2140}-\\x{2144}\\x{214A}-\\x{214D}\\x{214F}' . '\\x{2190}-\\x{244A}\\x{249C}-\\x{24E9}\\x{2500}-\\x{2775}\\x{2794}-\\x{2B59}' . '\\x{2CE5}-\\x{2CEA}\\x{2CF9}-\\x{2CFC}\\x{2CFE}-\\x{2CFF}\\x{2E00}-\\x{2E2E}' . '\\x{2E30}-\\x{3004}\\x{3008}-\\x{3020}\\x{3030}\\x{3036}-\\x{3037}' . '\\x{303D}-\\x{303F}\\x{309B}-\\x{309C}\\x{30A0}\\x{30FB}\\x{3190}-\\x{3191}' . '\\x{3196}-\\x{319F}\\x{31C0}-\\x{31E3}\\x{3200}-\\x{321E}\\x{322A}-\\x{3250}' . '\\x{3260}-\\x{327F}\\x{328A}-\\x{32B0}\\x{32C0}-\\x{33FF}\\x{4DC0}-\\x{4DFF}' . '\\x{A490}-\\x{A4C6}\\x{A4FE}-\\x{A4FF}\\x{A60D}-\\x{A60F}\\x{A673}\\x{A67E}' . '\\x{A6F2}-\\x{A716}\\x{A720}-\\x{A721}\\x{A789}-\\x{A78A}\\x{A828}-\\x{A82B}' . '\\x{A836}-\\x{A839}\\x{A874}-\\x{A877}\\x{A8CE}-\\x{A8CF}\\x{A8F8}-\\x{A8FA}' . '\\x{A92E}-\\x{A92F}\\x{A95F}\\x{A9C1}-\\x{A9CD}\\x{A9DE}-\\x{A9DF}' . '\\x{AA5C}-\\x{AA5F}\\x{AA77}-\\x{AA79}\\x{AADE}-\\x{AADF}\\x{ABEB}' . '\\x{E000}-\\x{F8FF}\\x{FB29}\\x{FD3E}-\\x{FD3F}\\x{FDFC}-\\x{FDFD}' . '\\x{FE10}-\\x{FE19}\\x{FE30}-\\x{FE6B}\\x{FEFF}-\\x{FF0F}\\x{FF1A}-\\x{FF20}' . '\\x{FF3B}-\\x{FF40}\\x{FF5B}-\\x{FF65}\\x{FFE0}-\\x{FFFD}');