How can I count the number of occurrences of a substring within a string?
Found in /usr/local/lib/perl5/5.8.8/pod/perlfaq9.podThere are a number of ways, with varying efficiency. If you want a count of a certain single character (X) within a string, you can use the "tr///" function like so: $string = "ThisXlineXhasXsomeXx'sXinXit"; $count = ($string =~ tr/X//); print "There are $count X characters in the string"; This is fine if you are just looking for a single character.
Related QuestionsPerl FAQIf you want a count of a certain character (X) within a string, you can use the tr/// function like so: string="ThisXlineXhasXsomeXx'sXinXit": $count = ($string =~ tr/X//); print "There are $count Xs in the string"; This is fine if you are just looking for a single character. However, if you are trying to count multiple character substrings within a larger string, tr/// won't work. What you can do is wrap a while loop around a pattern match.Related Questions
How do I convert a string to a number?
Updating the For Beginners forum FAQ - GameDev.Net Discussio...I am including the header file <string>, and I am using the string class, but the code doesn't compile? (namespace resolution, having the std:: topics) How do I use unique() with vectors? (answered only once, but still a good question to have due to people not knowing that it's possible to do)
Related QuestionsAKAAS :: C Interview Questions and Answers | C Frequently As...The standard C library provides several functions for converting strings to numbers of all formats (integers, longs, floats, and so on) and vice versa. strtod() Converts a string to a double-precision floating-point value and reports any “leftover” numbers that could not be converted. strtol() Converts a string to a long integer and reports any “leftover” numbers that could not be converted.Related Questions
How do I convert a std::string to a number?
Miscellaneous technical issues, C++ FAQ LiteThere are two easy ways to do this: you can use the <cstdio> facilities or the <iostream> library. In general, you should prefer the <iostream> library.
Related QuestionsWhat is the most efficient way to count the number of bits which are set in a value?
Infrequently Asked Questions in comp.lang.cStart a counter at zero and add one to it for each bit set. Some operating systems may provide a call to do this. For values over INT_MAX/2, start the counter at CHAR_BIT * sizeof(int) and subtract one for each bit not set.
Related QuestionsHow do occurrences occur?
The LabVIEW FAQ - The Block DiagramThere seem to be misconceptions about how exactly occurrences work and what exactly the "ignore previous" parameter on "Wait on Occurrence" (WoO) does. The following tries to explain, in a long and winded way, how they (functionally) behave: How Occurrences are "generated": When a VI is loaded (!) each "Generate Occurrence" function allocates exactly one unique occurrence.
Related QuestionsCan I use SPARQL to search for substring matches within literal values?
SPARQL Protocol and Query Language: SPARQL Frequently Asked ...SPARQL provides the function, regex(), which can be used to test whether a literal value contains a certain substring: SELECT ?title WHERE { _:book :title ?title . FILTER (regex(?title, "SPARQL")) . } The regex() function expects its first argument to be either a plain literal without a language tag or else a typed literal with a datatype of xsd:string. Plain literals with a language tag or typed literals of other datatypes will evaluate to a type error which causes the filter to fail.
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ABAP FAQ - ABAP Frequently Asked QuestionWhen we create a customer the information is updated in structure RF02D and the some tables like KNA1 are
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Humraz Property::Gold::Cash Lowest Unique Bid AuctionsThis provides you with an indication of how many more bids will be accepted before the auction closes.
Related QuestionsHow do I count the number of lines in a file?
perlfaq5One fairly efficient way is to count newlines in the file. The following program uses a feature of tr///, as documented in perlop. If your text file doesn't end with a newline, then it's not really a proper text file, so this may report one fewer line than you expect. $lines = 0; open(FILE, $filename) or die "Can't open '$filename': $!"; while (sysread FILE, $buffer, 4096) { $lines += ($buffer =~ tr/\n//); } close FILE;
Related QuestionsDo we count children in the guaranteed number?
Welcome to Ashton GardensChildren that are 6 years and under do not need to be counted in the per person count but please let us know how many 6 and under children you expect so that we can make note of it for set up. There are restrictions on the number of children so you will want to discuss counts with the Ashton Gardens catering manager. In order to maintain our high culinary standards we no longer allow outside catering.
Related QuestionsValue Type--will the value be a string, a number, a code, a block of text or what?
HL7 Frequently Answered QuestionsThis same segment has been used to send chemistries, microbiology reports, radiology reports, physical observations like height, weight, and coma scale and many other results and findings. It is discussed at length in Chapter 7 of the specification. Instead of looking for a field whose name describes the data you want to send, you should look for a code to go in the Observation Identifier field that describes that data.Return to Outline
Related QuestionsHow to convert a string to a number using JavaScript?
AKAAS :: JavaScript Interview Questions and Answers | JavaSc...You can use the parseInt() and parseFloat() methods. Notice that extra letters following a valid number are ignored, which is kinda wierd but convenient at times.
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Frequently Asked QuestionsProcess the number starting from the end (i.e.
Related QuestionsDo you string racquets?
Rocky Mountain Racquet Specialists - Frequently Asked Questi...We string racquets for tennis, racquetball, squash and badminton. String prices vary from $20-$60 installed and customization work is also available. Please see our string page for more information.
Related QuestionsHow often should I re-string my racquet?
Rocky Mountain Racquet Specialists - Frequently Asked Questi...The rule of thumb is to re-string your racquet as many times a year as you play in a week. Therefore, if you play three times a week, you should re-string your racquet every four months. Factors such as tennis elbow will effect how often you re-string your racquet. Please see our tips page for more information.
Related QuestionsWhat is a format string?
Digitizing Frequently Asked Questions (FAQ) for MicroScribe ...A format string is used by MicroScribe Utility Software (MUS) to format data coming from the MicroScribe so that a 3rd party application can accept and use the data. A set of standard format strings for popular software packages is included with MUS, and a user can also create custom format strings. See the MUS help file for more information on format strings.
Related QuestionsHow do I split a string?
Frequently Asked Questions for comp.lang.lispThere is no 'right' answer to this question; many lisp programmers have rolled their own solution in the past, and others are of the view that it should never be necessary, as long as all sequence functions are used with consistent :start and :end arguments. However, a community-based 'standard' was developed in June/July 2001 on comp.lang.lisp; known as SPLIT-SEQUENCE (formerly PARTITION), it works as follows in its simplest form: split-sequence #\Space "A stitch in time saves nine.
Related QuestionsSect. 19) What is the "substring trap"?
Java Programmer's FAQ - Part DThe "substring trap" is the name for a mistake that is all too easy to make when using the substring() method of class String. The method signature is: public String substring(int beginIndex, int endIndex) Char 'a' is at position 1 in the String, and 'b' is at 2, which is 3-1. It seems to be done this way so that s.substring(0,s.length()) is equal to s. If so, the name of the second parameter should be something like endIndxPlusOne. But not the confusing and misleading endIndex.
Related QuestionsHow can find a string?
Exontrol Software - ExEdit FAQ pageThe control provides Find and Replace support. The AllowFind property specifies whether the control can search for a string using the built-in Find dialog. By default, the AllowFind property is True. The control displays the Find dialog if the user presses CTRL+F key.
Related QuestionsHow do I count the number of words in my manuscript?
MISC.WRITING FAQStart at the beginning. Point at the first word and say "One." Point at the second word and say "Two." Repeat, increasing the count by one integer for each word at which you point. <g> You could use the "Word Count" feature of your word processor. Note that all word processors do not use the same algorithm to compute this--Word may give a different figure than WordPerfect. Count the words on five random pages of the manuscript.
Related QuestionsHow can I count the number of frames in my metafile?
NCAR Graphics FAQWe used to recommend using a script called "ncgm2gif" for converting NCGMs to GIF files. However, "ncgm2gif" has become a bit outdated, and there are better methods for converting to other raster formats. Our recommendation is to start with a PostScript (PS) or Encapsulated PostScript (EPS) file, and then use "convert" from the ImageMagick suite of tools to convert the PS file to another format like GIF, PNG, or even MPEG. You can get the ImageMagick suite from: http://www.imagemagick.
Related QuestionsHow can I count the number of visitors to my website?
IU Webmaster FAQ (List of Frequently Asked Questions)The webmaster also provides Analog access statistics for accounts on Veritas and Champion. You can view these stats at the URL http://www-reports.iu.edu/account_name/. Note that there is no tilde (~) before your account name in this URL.
Related QuestionsHow can I count the number of entries a search found?
PerLDAP: Frequently Asked QuestionsUsing the information from the previous question, the answer is of course: $cld = $conn->getLD(); $res = $conn->getRes(); $count = Mozilla::LDAP::API::ldap_count_entries($cld, $res); Again, this is not really recommended, and this might change in future releases. One possibility is to add this feature as a native method, but I need to investigate this further, since v2.0 of PerLDAP might use asynchronous LDAP calls (for much better scalability).
Related QuestionsDo we count the wedding party in the guaranteed number?
Welcome to Ashton GardensYes, you must include the wedding party in your final guest count. Food for photographer or other outside vendors will not be provided unless approved by you and purchased.
Related QuestionsHow does TWS count on the number of users?
ERP Software Solution | ERP | One Stop Help | Sales Enquiry ...For all users, we count by the number of login names. For purchase package, the license fee is paid once-and-for-all. Yes, ASP users will use our data center server with back up and 24-hour security. For purchase users, they can choose to host in their own server or the data center server.
Related QuestionsQ10: How can I get a count of the number of items I have selected ?
Unofficial ANSYS HOWTO---FAQA10: The *get command will allow you to get just about any information you want about selected items and allow you to store the result in a parameter/variable. Here is an example that with count the selected nodes and put the result in NODECNT *get,NODECNT,node,,count
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