Regular Expression
Overview:
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Meta: - '.' # Any - '^' # Begin, []内先頭はNot - '$' # End - '*' # 0<= '.*' Any x 0<= - '+' # 1<= '.+' Any x 1<= - '?' # 0|1 - '|' # OR - '[]' # Any in [] '['、'\'、先頭'^'のみエスケープ - '()' # Group, Capture 前方:\1,\2,\3... 後方:$1,$2,$3... - '{n}' # Repeat n times - '{n,}' # Repeat n<= - '{n,m}' # Repeat n<=&<=m ShortCut: - '\a' # 任意の英数字 : ([a-zA-Z0-9]) - '\b' # 空白 : ([ \\t]) ?? # 単語の境界 ?? - '\c' # 任意の英字 : ([a-zA-Z]) - '\d' # 任意の 10 進数字 : ([0-9]) - '\h' # 任意の 16 進数字 : ([0-9a-fA-F]) - '\n' # 改行文字 : (\r|(\r?\n)) # \r,\r\n,\n - '\q' # 引用符で囲まれた文字列 : (\"[^\"]*\")|(\'[^\']*\') - '\w' # 英単語 : ([a-zA-Z]+) - '\z' # 整数 : ([0-9]+) - '\D' # - '\S' # - '\W' #
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'^$' # '' '^aaa$' # 'aaa' [aA]aa # aaa | Aaa aa[ABC] # aaA | aaB | aaC aa[B-D] # aaB | aaC | aaD aa[b-dB-D] # aab | aac | aad | aaB | aaC | aaD aa[ABC]* # aa | aaA | aaBB | ... aa[^BC] # aaA | aaD | aaE | ... ao+aa # aoaa | aooaa | aoooaa | ... '+' repeat 0 < ao?aa # aaa | aoaa '?' 0 or 1 ao{3}aa # aoooaa '?' times ao{2.}aa # aooaa |aoooaa | aooooaa | ... '?' times < a.aa # a aa | a1aa | azaa | ... '.' any aa¥d # aa0 | aa1 | aa2 | ... '¥d' number aa¥d+ # aa0 | aa11 | aa234 | ... '¥d' number, repeat 0 < aa¥D # aaa | aaB | aaC | ... '¥D' not number ^(https?|ftp)(:\/\/[-_.!~*\'()a-zA-Z0-9;\/?:\@&=+\$,%#]+)$: URL ^(https?|ftp) (:// [-_.!~*'()a-zA-Z0-9;/?:@&=+$,%#]+ )$ (?P<name>pattern) # Named Capturing Group nameで値を参照
