Python: Having confusion in Regex -


my code (in python 2.7 using anaconda), 

import re regex = r"([a-z]+) (\d+)" str = "hello 3 hello regex example" matchobject = re.search(regex, str) print matchobject if matchobject not none:     print matchobject.start()     print matchobject.end()     print matchobject.group(0)     print matchobject.group(1)     print matchobject.group(2)

when regex search pattern return output in format:

line 1: <_sre.sre_match object @ 0x10a2568b0> line 2: 0 line 3: 7 line 4: hello 3 line 5: hello line 6: 3

i have added line number in output better understanding, line 1 of output confusing, , line 3 (output=7) confusing. can explain line 1 , line 3 of output?

those print numbers correspond print statements

print matchobject #line 1, python has interpret regex match object string , gives it's type , address if matchobject not none:     print matchobject.start() #line 2, full match "hello 3", 0 chars away start of input     print matchobject.end() #line 3, full match "hello 3", ends after 7 characters     print matchobject.group(0) #line 4, full match (regex group 0) "hello 3"     print matchobject.group(1) #line 5, captured hello first parens     print matchobject.group(2) #line 6, captured 3 second

nothing here seems incorrect me


Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more