.concat() 如:string1.concat(string2);连接字符串 和“”+“”功能是一样的 3)。.format() 创建格式化字符串 4)。.endsWith() .startwith()测试此字符串是否以指定的前缀开始。 5)..equals() 比较组成字符串内容的字符是否相等 ==比较两字符串在内存的首地址是否相等,即判断是否是同一个字符串对象。
; public static void main(String[] args) { Matcher m = Pattern.compile("([a-z]|\\s+[a-z])\\w+").matcher(POEM); Set<String> words = new TreeSet<String>(); while(m.find()) { words.add(m.group()); } System.out.println("Number of unique non-cap words = " + words.size...
The Backslash Character and Special Expressions The symbols \< and \> respectively match the empty string at the beginning and end of a word. The symbol \b matches the empty string at the edge of a word, and \B matches the empty string provided it's not at the edge of a word. The...
ends with -abc the abc is in the middle The " -o" option shows only the matched string (this is how you avoid returning the entire line that matches): The " -o" option followed by the " -b" option shows the position of the matched string (returns character position, not line numbe...
Context control:-B,--before-context=NUMprintNUMlinesofleading context-A,--after-context=NUMprintNUMlinesoftrailing context-C,--context=NUMprintNUMlinesofoutput context-NUMsameas--context=NUM--group-separator=SEPuseSEPasa group separator--no-group-separator use empty stringasa group separator--color[=...
For instance, to search for a line in a file named testfile1 that starts with the string “this” and ends with the string “data”, we have used the following command: $ grep“this.*data” testfile1 It will print the whole line from the testfile1 containing the expression (starting...
-B,--before-context=NUM print NUM lines of leading context-A,--after-context=NUM print NUM lines of trailing context-C,--context=NUM print NUM lines of output context-NUM same as--context=NUM--group-separator=SEP use SEP as a group separator--no-group-separator use empty string as a...
Finding a specific string Demonstrating a specific sequence and ends with a specific digit Yielding a certain output for a given command Locating all strings with 'abc' in them Skills Practiced Problem solving- use acquired knowledge to solve grep pattern practice problems ...
Here we used the $ following by a quoted string. More information can be found on this page. Words of the form $'string' are treated specially. The word expands to string, with backslash-escaped characters replaced as specified by the ANSI C standard. Basically, we wanted the escape char...
(ERE) alias fgrep = 'ugrep -F' # find string(s) alias pgrep = 'ugrep -P' # search with Perl regular expressions alias xgrep = 'ugrep -W' # search (ERE) and output text or hex for binary alias zgrep = 'ugrep -zG' # search compressed files and archives with BRE alias z...